14916

[실5] 14916 - 거스름돈

#include using namespace std; int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); int n, res = 0; cin >> n; if (n < 5) res = (n % 2 == 0) ? n / 2 : -1; else { int q = n / 5; if (n % 5 == 0) res = q; else { int remain = n - q * 5; if (remain % 2 == 0) res = q + remain / 2; else res = (q - 1) + (remain + 5) / 2; } } cout