#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ld long double
#define pii pair<int, int>
#define F first
#define S second
#define pb push_back
#define fast ios::sync_with_stdio(false), cin.tie(NULL)
const int MAXN = 2e5 + 5;
const int MOD = 1e9 + 7;
const int INF = 1e18;
const int SQ = 350;
const int LG = 23;
signed main()
{
fast;
int n;
cin >> n;
int a[n], b[n];
for (int i = 0; i < n; i++)
cin >> a[i] >> b[i];
bool f1 = 0, f2 = 0;
for (int i = 0; i < n; i++)
if (a[i])
f1 = 1;
for (int i = 0; i < n; i++)
if (b[i])
f2 = 1;
if (!f1 && !f2)
return cout << "YES", 0;
if (f1 ^ f2)
return cout << "NO", 0;
while (true)
{
bool good = 1;
for (int i = 0; i < n; i++)
if (a[i] > b[i])
good = 0;
if (good)
break;
for (int i = 0; i < n; i++)
if (a[i] > b[i])
{
int x = (a[i] - b[i] + 1) >> 1;
a[i] -= x * 2;
a[(i + 1) % n] += x;
}
}
bool good = 1;
for (int i = 0; i < n; i++)
if (a[i] != b[i])
good = 0;
if (good)
cout << "YES";
else
cout << "NO";
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |