Submission #979947

#	Time	Username	Problem	Language	Result	Execution time	Memory
979947		peterandvoi	Remittance (JOI19_remittance)	C++17	100 / 100	166 ms	36488 KiB

remittance

#include <bits/stdc++.h>

using namespace std;

#ifdef ngu
#include "debug.h"
#else
#define debug(...) 42
#endif

using ll = int64_t;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    #ifdef ngu
    freopen("test.inp", "r", stdin);
    freopen("test.out", "w", stdout);
    #endif
    int n;
    cin >> n;
    vector<ll> a(n), b(n);
    for (int i = 0; i < n; ++i) {
        cin >> a[i] >> b[i];
    }
    if (*max_element(b.begin(), b.end()) == 0) {
        cout << (*max_element(a.begin(), a.end()) > 0 ? "No" : "Yes");
        exit(0);
    }
    bool okay = true;
    while (okay) {
        okay = false;
        for (int i = 0; i < n; ++i) {
            if (a[i] > b[i]) {
                ll x = (a[i] - b[i] + 1) / 2;
                a[i] -= x * 2;
                a[(i + 1) % n] += x;
                okay = true;
            }
        }
    }
    okay = true;
    for (int i = 0; i < n; ++i) {
        okay &= (a[i] == b[i]);
    }
    cout << (okay ? "Yes" : "No");
}

• Subtask 1: 15 / 15
• Subtask 2: 40 / 40
• Subtask 3: 45 / 45