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C++ 標準入出力 メモ

Last updated at Posted at 2022-02-21

競技プログラミングなどの問題解くときに必要になる基本的なコードのメモ。

標準入力読み取り 行毎

    using namespace std;

    string l;
    while (getline(cin,l)) {
        // 2行目以降の処理
    }

スペース区切りstring 数値変換

#include <iostream>
#include <string>
#include <sstream> // istringstream

using namespace std;
int main(void){

string l("123 678");
int a1(0),a2(0);
istringstream iss = istringstream(l);
iss >> a1 >> a2;
cout << a1 << endl;
cout << a2 << endl;
}

 文字列→数値 (stoi)

#include <iostream>
#include <string>
using namespace std;

auto i = std::stoi("123");
cout << i << endl;
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