Submission #922791

#	Time	Username	Problem	Language	Result	Execution time	Memory
922791		phoenix0423	Remittance (JOI19_remittance)	C++17	0 / 100	1 ms	348 KiB

remittance

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pll;
#define fastio ios::sync_with_stdio(false), cin.tie(0)
#define pb push_back
#define eb emplace_back
#define f first
#define s second
#define int long long
const int INF = 1e12;

signed main(void){
    fastio;
    int n;
    cin>>n;
    vector<int> a(n);
    for(int i = 0; i < n; i++){
        int x, y;
        cin>>x>>y;
        a[i] = x - y;
    }
    for(int i = 0; i < n; i++){
        if(a[i] > 0 && a[i] % 2){
            int nd = 2;
            int id = (i - 1 + n) % n;
            while(id != i && a[id] < nd && nd < INF){
                nd -= a[id], a[id] = 0;
                nd *= 2;
                id = (id - 1 + n) % n;
            }
            if(a[id] < nd){
                cout<<"No\n";
                return 0;
            }
            a[id] -= nd;
            a[i] ++;
        }
    }
    for(int i = 0; i < n; i++){
        if(a[i] < 0){
            int nd = - a[i] * 2;
            int id = (i - 1 + n) % n;
            while(id != i && a[id] < nd && nd < INF){
                nd -= a[id], a[id] = 0;
                nd *= 2;
                id = (id - 1 + n) % n;
            }
            if(a[id] < nd){
                cout<<"No\n";
                return 0;
            }
            a[id] -= nd;
            a[i] = 0;
        }
    }
    for(auto x : a){
        if(x){
            cout<<"No\n";
            return 0;
        }
    }
    cout<<"Yes\n";
}

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