Submission #1122522

#	Time	Username	Problem	Language	Result	Execution time	Memory
1122522		Pacybwoah	Remittance (JOI19_remittance)	C++20	100 / 100	406 ms	23888 KiB

remittance

#include<iostream>
#include<vector>
using namespace std;
typedef long long ll;
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    vector<ll> vec(n), oa(n), ob(n);
    ll sum = 0;
    for(int i = 0; i < n; i++){
        ll a, b;
        cin >> a >> b;
        vec[i] = a - b;
        sum += vec[i];
        oa[i] = a;
        ob[i] = b;
    }
    int ca = 0, cb = 1, cnt = 0;
    while(sum > 0 && cnt <= 100 * n){
        cnt++;
        if(vec[ca] > 0){
            if(vec[ca] & 1){
                if(ob[ca] == 0){
                    sum -= vec[ca] / 2;
                    vec[cb] += vec[ca] / 2;
                    vec[ca] = 1;
                }
                else{
                    sum -= (vec[ca] + 1) / 2;
                    vec[cb] += (vec[ca] + 1) / 2;
                    vec[ca] = -1;
                }
            }
            else{
                sum -= vec[ca] / 2;
                vec[cb] += vec[ca] / 2;
                vec[ca] = 0;
            }
        }
        ca++;
        cb++;
        if(cb == n) cb = 0;
        if(ca == n) ca = 0;
    }
    if(sum != 0){
        cout << "No\n";
        return 0;
    }
    for(int i = 0; i < n; i++){
        if(vec[i] != 0){
            cout << "No\n";
            return 0;
        }
    }
    cout << "Yes\n";
}

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