# 13776 - Doraemon visits NTHU

>author: Utin
###### tags: `string`

---

## Brief
See the code below

## Solution 0

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char delim[4] = "\n,:";
char ans[1001];
char line[1001];
char key[19] = "UNDER CONSTRUCTION";
char* ptr = ans; // point to the tail of ans

void tran(char* p);

int main() {
    char* name, * status;

    while (fgets(line, 1001, stdin) != NULL) {

        name = strtok(line, delim); // get the first name of line

        while (name != NULL) {

            status = strtok(NULL, delim); // get the status
            tran(status); // transform the status to upper class

            // check if the keywords exist or not
            if (strstr(status, key) != NULL) {

                // if name == line, then there isn't " " before name
                if (name == line) {

                    // check if the place is in the list or not
                    if (strstr(ans, name) == NULL) {
                        strcpy(ptr, name);   // copy name to ans tail
                        ptr += strlen(name); // update ptr to ans tail
                        *ptr = '\n';         // add '\n' behind the place
                        ptr++;               // update ptr to ans tail
                    }
                }

                // because we don't set " " as delimeters,
                // so the first character of name must be a " "
                // we should use name+1 refer to the first character of name
                else {

                    // check if the place is in the list or not
                    if (strstr(ans, name+1) == NULL) {
                        strcpy(ptr, name+1);   // copy name to ans tail
                        ptr += strlen(name+1); // update ptr to ans tail
                        *ptr = '\n';           // add '\n' behind the place
                        ptr++;                 // update ptr to ans tail
                    }
                }
            }

            // get the next name
            name = strtok(NULL, delim);
        }
    }

    // output
    // ans would be like "place_a\nplace_b\n...place_z\n"
    printf("%s", ans);
    }

void tran(char* p) {
    while (p != NULL && *p != '\0') {
        if(*p > 'Z') *p -= 32;
        p++;
    }
}
// By Utin

## Reference