[BOJ 5585] 거스름돈

문제 출처

https://www.acmicpc.net/problem/5585

소스코드

#include <iostream>
using namespace std;
// 단순 반복문 문제
// greedy algorithm
int main(int argc, char** argv) {
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    int coins[] = {500, 100, 50, 10, 5, 1};
    int nCost, ans=0;
    cin>>nCost;
    int nRemainder = 1000 - nCost;
    for (int i=0; i<6; i++) {
        while (nRemainder - coins[i] >= 0) {
            nRemainder -= coins[i];
            ans++;
            if (nRemainder == 0) {
                break;
            }
        }
    }
    cout<<ans;
    return 0;
}