# 11447 - Use std::map
>author: Utin
###### tags: `STL`

---

## Brief
See the code below

## Solution 0

#include <bits/stdc++.h>
#include "function.h"

void oj::insert(std::map<int, oj::String> &ma, int key, const std::string &str) {
    std::string insertion = str;
    for (auto it : ma) {
        if (it.first == key) {
            insertion += it.second.str;
            ma.erase(key);
            break;
        }
    }
    ma.insert({key, oj::String(insertion)});
}

void oj::output(const std::map<int, oj::String> &ma, int begin, int end) {
    for (auto it = ma.begin(); it != ma.end(); it++)
        if (it->first >= begin && it->first <= end)
            std::cout << it->second << ' ';
}

void oj::erase(std::map<int, oj::String> &ma, int begin, int end) {
    for (int i = begin; i <= end; i++) ma.erase(i);
}

std::ostream &oj::operator<<(std::ostream &output, const std::map<int, oj::String> &x) {
    for (auto it : x) output << it.second << ' ';
    return output;
}

// By Utin

## Reference