# coding
```cpp
#include <iostream>
using namespace std;
int main() {
int luckyNum[] = {5, 13, 88};
int guess[3];
string s[] = {"first", "second", "third"};
for (int i = 0; i < 3; i++) {
cout << "Enter the " << s[i] << " lucky number: ";
cin >> guess[i];
}
// i j guess[i] luckyNum[j]
// 0 0 5 5
// 0 1 5 13
// 0 2 5 88
// 1 0 5 5
// 1 1 5 13
// 1 2 5 88
// 2 0 5 5
// 2 1 5 13
// 2 2 5 88
bool correct[3] = {false, false, false};
// first loop for `guess`
for (int i = 0; i < 3; i++) {
// second loop for `luckyNum`
for (int j = 0; j < 3; j++) {
if (guess[i] == luckyNum[j]) {
correct[j] = true;
// guess = {5, 5, 5}
// luckyNum = {5, 13, 88}
// correct = {T, F, F}
}
}
}
for (int i = 0; i < 3; i++) {
if (correct[i] == false) {
cout << "You Lose!!" << endl;
return 0;
}
}
cout << "You are Baba's lucky guy!!" << endl;
return 0;
}
```
```
O| |
------
X|O|X
------
| |O
```
```cpp
#include <iostream>
using namespace std;
class Phone {
string color;
string name;
int quantity;
public:
Phone(string acolor, string aname, int aquantity) {
color = acolor
name = aname
quantity = aquantity
}
string getName() {
return name;
}
void setName(string newName) {
name = newName;
}
};
int main() {
Phone phone1("White", "Iphone", 3);
// phone1.name = "abc"; // failed
Phone phone2("Pink", "Samsung", 5);
cout << phone1.getName() << endl;
return 0;
}
```
```cpp
#include <iostream>
using namespace std;
void print(int arry[]) { cout << sizeof(arry) << endl; };
int main() {
int guess[] = {3, 44, 55, 66, 4, 33, 555, 55};
cout << sizeof(guess) << endl;
print(guess);
return 0;
}
```
```cpp
#include <iostream>
//#include <limits>
using namespace std;
void print(int arry[], int size) {
for (int i = 0; i < size; i++) {
cout << arry[i] << "\t";
}
cout << endl;
};
int main() {
int count = 0;
const int SIZE = 10;
int guess[SIZE];
for (int i = 0; i < SIZE; i++) {
if (cin >> guess[i]) {
count++;
} else {
break;
}
}
print(guess, count);
cin.clear();
cin.ignore(1000000, '\t');
// cin.ignore(numeric_limits<streamsize> max(), '\n');
string test;
cin >> test;
cout << test << endl;
return 0;
}
```
```cpp
#include <cstdlib>
#include <ctime>
#include <iostream>
#include <string>
using namespace std;
void playgame() {
int random = rand() % 100;
cout << "Enter the number: ";
while (true) {
int guess;
cin >> guess;
if (guess == random) {
cout << "You win!" << endl;
break;
} else if (guess < random) {
cout << "too low" << endl;
} else {
cout << "too high" << endl;
}
}
}
int main() {
srand(time(NULL));
int choice;
do {
cout << "0.Quit" << endl;
cout << "1.Play" << endl;
cin >> choice;
switch (choice) {
case 0:
cout << "Thanks for nothing." << endl;
return 0;
case 1:
playgame();
break;
}
} while (choice != 0);
;
}
```
```cpp
#include <cstdlib>
#include <ctime>
#include <iostream>
#include <string>
using namespace std;
void playgame() {
int random = rand() % 100;
while (true) {
string s;
int guess;
bool isDigit = true;
cout << "Enter the number: ";
cin >> s;
for (int i = 0; i < s.size(); ++i) {
if (!isdigit(s[i])) {
cout << "This is not a number!!!!!" << endl;
isDigit = false;
break;
}
}
if (!isDigit) continue;
guess = atoi(s.c_str());
if (guess == random) {
cout << "You win!" << endl;
break;
} else if (guess < random) {
cout << "too low" << endl;
} else {
cout << "too high" << endl;
}
}
}
int main() {
srand(time(NULL));
int choice;
do {
cout << "0.Quit" << endl;
cout << "1.Play" << endl;
cin >> choice;
switch (choice) {
case 0:
cout << "Thanks for nothing." << endl;
return 0;
case 1:
playgame();
break;
default:
cout << "Wrong number" << endl;
break;
}
} while (choice != 0);
;
}
```
```cpp
#include <iostream>
#include <limits>
using namespace std;
void print(int arry[], int size) {
for (int i = 0; i < size; i++) {
cout << arry[i] << "\t";
}
cout << endl;
};
int main() {
int count = 0;
const int SIZE = 10;
int guess[SIZE];
for (int i = 0; i < SIZE; i++) {
if (cin >> guess[i]) {
count++;
} else {
break;
}
}
print(guess, count);
/*
cout << "============" << endl;
int a = 10;
int* p = &a;
cout << a << endl;
cout << &a << endl;
cout << p << endl;
cout << *p << endl;
*p = 3;
cout << a << endl;
a = 20;
cout << a << endl;
cout << *p << endl;
cout << "============" << endl;
int arr[3] = {1, 2, 3};
cout << arr << endl;
cout << arr[0] << endl;
cout << &(arr[0]) << endl;
cout << arr[1] << endl;
cout << &(arr[1]) << endl;
cout << "============" << endl;
cout << sizeof(a) << endl;
cout << sizeof(&a) << endl;
cout << "============" << endl;
*/
cin.clear();
// cin.ignore(1000000, 'n');
cin.ignore(numeric_limits<streamsize>::max(), '\n');
string test;
cin >> test;
cout << test << endl;
return 0;
}
```
```cpp
#include <cstdlib>
#include <ctime>
#include <iostream>
#include <string>
using namespace std;
void play_array(int array[], int count) {
for (int i = 0; i < count; i++) {
cout << array[i] << "\t"
<< "\n";
}
}
void playgame() {
int guesses[100];
int guess_count = 0;
int random = rand() % 100;
while (true) {
string turn;
int num;
bool isDig = true;
cout << "Enter a number: ";
cin >> turn;
for (int i = 0; i < turn.size(); i++) {
if (!isdigit(turn[i])) {
cout << "This is not a number." << endl;
isDig = false;
break;
}
}
if (!isDig) continue;
num = atoi(turn.c_str());
guesses[guess_count++] = num;
if (random == num) {
cout << "You win!" << endl;
break;
} else if (num < random) {
cout << "too low" << endl;
} else {
cout << "too high" << endl;
}
}
play_array(guesses, guess_count);
}
int main() {
srand(time(NULL));
int choice;
do {
cout << "0.Quit" << endl;
cout << "1.Play" << endl;
cin >> choice;
switch (choice) {
case 0:
cout << "Thanks for nothing." << endl;
return 0;
case 1:
playgame();
break;
default:
cout << "Select again" << endl;
break;
}
} while (choice != 0);
return 0;
}
```
```cpp
#include <cstdlib>
#include <ctime>
#include <fstream>
#include <iostream>
#include <string>
#include <vector>
using namespace std;
void play_vector(vector<int> vector) {
for (int i = 0; i < vector.size(); i++) {
cout << vector[i] << "\t" << endl;
}
}
void playgame() {
vector<int> guesses;
int count = 0;
int random = rand() % 100;
while (true) {
string turn;
bool isNum = true;
cout << "Enter a number:";
cin >> turn;
count++;
for (int i = 0; i < turn.size(); i++) {
if (!isdigit(turn[i])) {
cout << "This is not a number!" << endl;
isNum = false;
break;
}
}
if (!isNum) continue;
int guess = atoi(turn.c_str());
guesses.push_back(guess);
if (guess == random) {
cout << "You win!" << endl;
break;
} else if (guess < random) {
cout << "too low" << endl;
} else {
cout << "too high" << endl;
}
}
// check if there is file `best_score`
// https://dotblogs.com.tw/v6610688/2013/11/11/cplusplus_check_file_exist
// if no, output `count` to `best_score`
// if yes, read the best score from `best_score`
// ofstream file("best_score");
// int i = 9999;
// file << i;
ifstream input("best_score");
int best_score;
input >> best_score;
ofstream output("best_score");
if (count < best_score) {
output << count;
} else {
output << best_score;
}
play_vector(guesses);
}
int main() {
srand(time(NULL));
int choice;
do {
cout << "0.Quit" << endl;
cout << "1.Play" << endl;
cin >> choice;
switch (choice) {
case 0:
cout << "Thanks for nothing." << endl;
return 0;
case 1:
playgame();
break;
default:
cout << "Select again" << endl;
break;
}
} while (choice != 0);
return 0;
}
```
```cpp
#include <cstdlib>
#include <ctime>
#include <fstream>
#include <iostream>
#include <string>
#include <vector>
using namespace std;
void play_vector(vector<int> vector) {
for (int i = 0; i < vector.size(); i++) {
cout << vector[i] << "\t" << endl;
}
}
void playgame() {
vector<int> guesses;
int count = 0;
int random = rand() % 100;
while (true) {
string turn;
bool isNum = true;
cout << "Enter a number:";
cin >> turn;
count++;
for (int i = 0; i < turn.size(); i++) {
if (!isdigit(turn[i])) {
cout << "This is not a number!" << endl;
isNum = false;
break;
}
}
if (!isNum) continue;
int guess = atoi(turn.c_str());
guesses.push_back(guess);
if (guess == random) {
cout << "You win!" << endl;
break;
} else if (guess < random) {
cout << "too low" << endl;
} else {
cout << "too high" << endl;
}
}
ifstream input("best_score");
ofstream output("best_score");
int best_score;
if (input.good()) {
input >> best_score;
if (count < best_score) {
output << count;
} else {
output << best_score;
}
} else {
output << count;
}
play_vector(guesses);
}
int main() {
srand(time(NULL));
int choice;
do {
cout << "0.Quit" << endl;
cout << "1.Play" << endl;
cin >> choice;
switch (choice) {
case 0:
cout << "Thanks for nothing." << endl;
return 0;
case 1:
playgame();
break;
default:
cout << "Select again" << endl;
break;
}
} while (choice != 0);
return 0;
}
```
```cpp
#include <iostream>
using namespace std;
int main() {
int num;
int x;
int y;
for (int j = 1; j <= 5; j++) {
cin >> num;
for (int i = 1; i <= 5; i++) {
x = i;
y = j;
}
if (num == 1) {
cout << abs(x - 3) + abs(y - 3) << endl;
}
}
return 0;
}
```
```cpp
#include <iostream>
using namespace std;
int main() {
int num;
int x;
int y;
// 0 0 0 0 0
// 0 0 0 0 0
// 0 1 0 0 0
// 0 0 0 0 0
// 0 0 0 0 0
// num:0
// x:1
// i:1
// j:1
// y:1
//
for (int i = 1; i <= 5; i++) {
x = i;
for (int j = 1; j <= 5; j++) {
cin >> num;
y = j;
if (num == 1) {
cout << abs(x - 3) + abs(y - 3) << endl;
}
}
}
return 0;
}
```
```cpp
#include <algorithm>
#include <iostream>
using namespace std;
int main() {
char line[50];
int n;
int t;
cin >> n >> t;
cin >> line;
for(int j =0; j < t; j++){
for (int i = 0; i < n - 1; i++) {
if (line[i] == 'B' && line[i + 1] == 'G') {
swap(line[i], line[i + 1]);
i++;
}
}
}
// line = BBBGG -> BBGBG -> BGBGB
// j=1
// n=5
// t=2
// line=BGBGB
// i=3
// line[i] = B
// line[i+1] =G
//
cout << line << endl;
// https://codeforces.com/problemset/problem/266/B
// Let's say that the positions in the queue are sequentially numbered by integers from 1 to n,
// at that the person in the position number 1 is served first.
// Then, if at time x a boy stands on the i-th position and a girl stands on the (i + 1)-th position,
// then at time x + 1 the i-th position will have a girl and the (i + 1)-th position will have a boy.
// The time is given in seconds.
}
```
```cpp
#include <iostream>
#include <string>
using namespace std;
int main() {
string a;
cin >> a;
for (int i = 0; i < a.length(); i++) {
if (a[i] == '.') {
cout << 0 << endl;
} else if (a[i] == '-' && a[i + 1] == '.') {
cout << 1 << endl;
i++;
} else if (a[i] == '-' && a[i + 1] == '-') {
cout << 2 << endl;
i++;
}
}
// a = .-.-- 012
// i = 5
// a[i] = -
// a[i+1] = -
// 012
return 0;
}
```
```cpp
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
using namespace std;
int main() {
int x;
string a;
cin >> x;
while (true) {
x = x + 1;
string a = to_string(x);
int j = 0;
if (a[j] != a[j + 1] && a[j] != a[j + 2] && a[j] != a[j + 3] &&
a[j + 1] != a[j + 2] && a[j + 1] != a[j + 3] && a[j + 2] != a[j + 3]) {
cout << a << endl;
break;
}
}
return 0;
}
```
```cpp
#include <iostream>
#include <string>
using namespace std;
int main() {
string s;
int times;
bool on = true;
for (int j = 0; j < 3; j++) {
for (int i = 0; i < 3; i++) {
cin >> times;
times = times % 2;
s = to_string(times);
cout << s[i];
// if (s[i] == 1) {
// cout << !on;
// } else {
// cout << on;
// }
}
cout << endl;
}
}
// s =
// 1 0 0
// 0 0 0
// 0 0 1
//
// j = 0
// i = 0
// s[0] = 1
// s[1] s[-1] s[0]
// 1 0 0
// 0 0 0
// 0 0 1
// int x;
// bool on = true;
// int light[3][3];
// for (int i = 0; i < 3; i++) {
// for (int j = 0; j < 3; j++) {
// cin >> light[i][j];
// x = light [i][j]% 2;
// if (x == 1) {
// light[i][j] && light[i + 1][j] && light[i - 1][j] && light[i][j +
// 1]
// &&
// light[i][j - 1] == !on;
// } else {
// bool on = true;
// }
// if (on) {
// cout << on;
// } else {
// cout << !on;
// }
// }
// if (x == 0) {
// cout << on;
// } else {
// cout << !on;
// }
// }
// cout << endl;
```
```cpp
#include <iostream>
#include <string>
using namespace std;
int main() {
// times =
// 1 0 0
// 0 0 0
// 0 0 1
int times[3][3];
for (int j = 0; j < 3; j++) {
for (int i = 0; i < 3; i++) {
cin >> times[i][j];
}
}
// j = 0
// i = 0
// a = 1
// times[i][j] = 1
// times[i + 1][j] = 0
// times[i - 1][j]
//
for (int j = 0; j < 3; j++) {
for (int i = 0; i < 3; i++) {
int a = times[i][j];
if (i - 1 >= 0) {
a += times[i - 1][j];
}
if (j - 1 >= 0) {
a += times[i][j - 1];
}
if (i + 1 < 3) {
a += times[i + 1][j];
}
if (j + 1 < 3) {
a += times[i][j + 1];
}
is
if(a % 2 == 1){
cout << 0;
} else {
cout << 1;
}
}
cout << endl;
}
}
```
```cpp
#include <iostream>
using namespace std;
int main() {
int ans[3][3] = {{1, 1, 1}, {1, 1, 1}, {1, 1, 1}};
int x;
for (int j = 0; j < 3; ++j) {
for (int i = 0; i < 3; ++i) {
cin >> x;
ans[i][j] += x;
if (i != 0) ans[i - 1][j] += x;
if (i != 2) ans[i + 1][j] += x;
if (j != 0) ans[i][j - 1] += x;
if (j != 2) ans[i][j + 1] += x;
}
}
for (int j = 0; j < 3; ++j) {
for (int i = 0; i < 3; ++i) {
cout << ans[i][j] % 2;
}
cout << endl;
}
return 0;
}
```
```cpp
#include <cctype>
#include <iostream>
using namespace std;
int main() {
string str;
cin >> str;
int upper = 0;
int lower = 0;
for (int i = 0; i < str.length(); i++) {
if (isupper(str[i])) {
upper++;
} else if (islower(str[i])) {
lower++;
}
}
for (int j = 0; j < str.length(); j++) {
if (lower >= upper) {
if (isupper(str[j])) {
str[j] = str[j] + 32;
}
} else {
if (islower(str[j])) {
str[j] = str[j] - 32;
}
}
}
cout << str << endl;
}
```
```cpp
#include <cctype>
#include <iostream>
using namespace std;
int main() {
string str;
cin >> str;
for (int i = 0; i < str.length(); i++) {
if (islower(str[0])) {
str[0] = str[0] - 32;
}
}
cout << str << endl;
}
```
```cpp
#include <iostream>
using namespace std;
int main() {
int i = 123;
// the "length" of 0 is 1:
int len = 1;
// and for numbers greater than 0:
if (i > 0) {
// we count how many times it can be divided by 10:
// (how many times we can cut off the last digit until we end up with 0)
for (len = 0; i > 0; len++) {
i = i / 10;
}
}
// and that's our "length":
std::cout << len;
}
```
```cpp
#include <iostream>
using namespace std;
int main() {
int x;
cin >> x;
x = abs(x);
int n = 1;
while(x /= 10) ++n;
cout << n << endl;
}
```
```cpp
#include <iostream>
using namespace std;
int main() {
string s;
cin >> s;
for(int i = 0; i < s.length(); i++) {
if(s[i] != '4' && s[i] != '7') {
cout << "NO" << endl;
return 0;
}
}
cout << "YES" << endl;
return 0;
}
```
```cpp
#include <iostream>
using namespace std;
int main() {
string s;
cin >> s;
bool ans = true;
for (int i = 0; i < s.length(); i++) {
if (s[i] != '4' && s[i] != '7') {
ans = false;
break;
}
}
if (ans) {
cout << "YES" << endl;
} else {
cout << "NO" << endl;
}
return 0;
}
```
https://cses.fi/problemset/task/1621
https://codeforces.com/problemset/problem/110/A
```
g++ -std=c++17
```
```cpp
#include <iostream>
using namespace std;
int main() {
string s;
cin >> s;
int count = 0;
// 474700
for (int i = 0; i < s.length(); i++) {
if (s[i] == '4' || s[i] == '7') {
count++;
}
}
if (count == 4 || count == 7) {
cout << "YES" << endl;
} else {
cout << "NO" << endl;
}
}
```
```cpp
#include <iostream>
using namespace std;
int main() {
int take = 0;
int n;
string s;
cin >> n;
cin >> s;
for (int i = 0; i < n; i++) {
if (s[i] == s[i + 1]) {
take++;
}
}
cout << take << endl;
}
```
```cpp
#include <iostream>
using namespace std;
int main() {
int n;
int m;
int x[] = {2, 3, 5, 7};
cin >> n >> m;
if (m == 3) {
cout << "YES" << endl;
return 0;
}
for (int j = 1; j < m - n; j++) {
bool isPrime = true;
for (int k = 0; k < 4; k++) {
if (n + j <= x[k]) break;
if ((n + j) % x[k] == 0) {
isPrime = false;
break;
}
}
//n = 3
//m = 7
//j = 1
//isPrime = false
//k = 0
//n + j = 4
//x[k] = 2
if (isPrime) {
cout << "NO" << endl;
return 0;
}
}
if (m == 5 || m == 7) {
cout << "YES" << endl;
return 0;
}
if (m % 2 == 0 || m % 3 == 0 || m % 5 == 0 || m % 7 == 0) {
cout << "NO" << endl;
} else {
cout << "YES" << endl;
}
return 0;
}
```
https://www.sciencedaily.com/releases/2018/01/180104164507.htm
https://en.wikipedia.org/wiki/Largest_known_prime_number
https://zh.wikipedia.org/wiki/%E6%A2%85%E6%A3%AE%E7%B4%A0%E6%95%B0
https://zh.wikipedia.org/wiki/%E8%B2%BB%E9%A6%AC%E6%95%B8
```cpp
#include <iostream>
#include <vector>
using namespace std;
int main() {
int n, m, a;
cin >> n >> m;
vector<int> v;
for (int i = 1; i <= n; i++) {
cin >> a;
v.push_back(a);
}
int max1 = 0, max2, x, locate;
for (int i = 0; i < n; i++) {
x = v[i] / m;
if (v[i] % m != 0) {
max2 = x + 1;
if (max2 >= max1) {
max1 = max2;
locate = i;
}
} else if (v[i] % m == 0) {
max2 = x;
if (max2 >= max1) {
max1 = max2;
locate = i;
}
}
}
cout << locate + 1 << endl;
return 0;
}
```
``` cpp
#include <iostream>
#include <queue>
using namespace std;
int main() {
int n, m, ans;
cin >> n >> m;
int a;
queue<int> x, y;
for (int i = 1; i <= n; i++) {
cin >> a;
x.push(a);
y.push(i);
}
while (!x.empty()) {
if (x.front() <= m) {
x.pop();
y.pop();
} else {
x.push(x.front() - m);
y.push(y.front());
x.pop();
y.pop();
}
}
ans = y.back();
cout << ans << endl;
return 0;
}
// 1 3 1 4 2
// m: 2
// x: 1 4 2 1
// y: 3 4 5 2
```
巴巴～貼個題目網址
等等看～
https://codeforces.com/problemset/problem/450/A
https://codeforces.com/problemset/problem/165/A
```cpp
bool compX(pair<int, int> a, pair<int, int> b) {
if (a.first == b.first) {
return a.second < b.second;
}
return a.first < b.first;
}
bool compY(pair<int, int> a, pair<int, int> b) {
if (a.second == b.second) {
return a.first < b.first;
}
return a.second < b.second;
}
int main() {
int n;
cin >> n;
vector<pair<int, int>> vec(n);
for (int i = 0; i < n; ++i) {
int x, y;
cin >> x >> y;
vec[i] = {x, y};
}
sort(vec.begin(), vec.end(), compX);
for (int i = 0; i < vec.size(); ++i) {
cout << vec[i].first << " " << vec[i].second << endl;
}
// ...
sort(vec.begin(), vec.end(), compY);
// ...
}
// 8
// 1 1
// 4 2
// 3 1
// 1 2
// 0 2
// 0 1
// 1 0
// 1 3
```
```cpp
#include <iostream>
#include <vector>
#include <map>
using namespace std;
bool compX(pair<int, int> a, pair<int, int> b) {
if (a.first == b.first) {
return a.second < b.second;
} else {
return a.first < b.first;
}
}
int main() {
int n, x, y;
cin >> n;
vector<pair<int, int>> vec(n);
for (int i = 0; i < n; i++) {
cin >> x >> y;
vec[i] = {x, y};
}
sort(vec.begin(), vec.end(), compX);
map <pair<int , int> > m;
// 8
// 0 1
// 0 2
// 1 0
// 1 1
// 1 2
// 1 3
// 3 1
// 4 2
// if the times of duplicate number < 3
//
```
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