Submission #431680

#	Time	Username	Problem	Language	Result	Execution time	Memory
431680		kostia244	Virus Experiment (JOI19_virus)	C++17	0 / 100	10 ms	332 KiB

virus

#pragma GCC optimize("trapv")
#include<bits/stdc++.h>
using namespace std;
const int N = 1e6 + 16;
int n, a[N], b[N];
int main() {
    cin.tie(0)->sync_with_stdio(0);
    cin >> n;
    for(int i = 0; i < n; i++) {
        cin >> a[i] >> b[i];
    }
    for(int z = 100; z--;){
        for(int i = 0; i+1 < n; i++) {
            if(a[i] > b[i]) {
                a[i+1] += (a[i]-b[i]+1)/2;
                a[i] -= 2*((a[i]-b[i]+1)/2);
            }
        }
        if(a[n-1] > b[n-1]) {
            a[0] += (a[n-1]-b[n-1]+1)/2;
            a[n-1] -= 2*((a[n-1]-b[n-1]+1)/2);
        }
    }
    int ok = 1;
    for(int i = 0; i < n; i++) ok &= a[i] == b[i];
    cout << (ok?"Yes":"No") << '\n';
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 6
• Subtask 3: 0 / 80