제출 #1136869

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1136869		onbert	송금 (JOI19_remittance)	C++20	15 / 100	0 ms	328 KiB

remittance

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int maxn = 1e6 + 5, INF = 1e10;
int n;
int a[maxn], b[maxn];

signed main() {
    ios::sync_with_stdio(0); cin.tie(0);
    cin >> n;
    for (int i=0;i<n;i++) cin >> a[i] >> b[i];
    bool odd = false;
    for (int i=1;i<n;i++) {
        int cur = a[i] + odd;
        odd = false;
        int give = max((cur - b[i] + 1) / 2, (int)0);
        if (b[i]==0) give = a[i] / 2, odd = cur % 2;
        a[i] -= give * 2, a[(i+1)%n] += give;
        // cout << a[i] << " " << give << endl;
    }

    for (int i=1;i<n;i++) {
        int take = max(b[i] - a[i], (int)0);
        if (b[i] == 0 && a[i] == 1) take = 1;
        if (take > 0 && (i > 40 || ((int)1<<i) > INF / take)) {cout << "No\n"; return 0;}
        a[0] -= take * (1<<i);
        a[i] += take;
        if (a[0] < 0) {cout << "No\n"; return 0;}
        if (a[i] > b[i]) a[(i+1)%n] += (a[i] - b[i]) / 2, a[i] = b[i];
    }

    if (a[0] > b[0]) {
        if (n > 40) {cout << "No\n"; return 0;}
        int diff = a[0] - b[0];
        int thing = ((int)1 << n);
        if (diff % (thing-1) == 0 && a[0] - diff / (thing-1) * thing >= 0) cout << "Yes\n";
        else cout << "No\n";
        return 0;
    }
    if (a[0] == b[0]) cout << "Yes\n";
    else cout << "No\n";
}

• Subtask 1: 15 / 15
• Subtask 2: 0 / 40
• Subtask 3: 0 / 45