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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#756057#5141. Identical ParityshunhualinWA 13ms3608kbC++201.1kb2024-11-16 18:51:492024-11-16 18:51:49

Judging History

你现在查看的是最新测评结果

  • [2024-11-16 18:51:49]
  • 评测
  • 测评结果:WA
  • 用时:13ms
  • 内存:3608kb
  • [2024-11-16 18:51:49]
  • 提交

answer

#include <bits/stdc++.h>
#define int long long
#define endl "\n"
#define ll long long
const int mod = 1e9 + 7;
const int N = 1e5 + 50;
using namespace std;

ll exgcd(ll a, ll b, ll &x, ll &y) {
	if (b == 0) {
		x = 1;
		y = 0;
		return a;
	}
	ll d = exgcd(b, a%b, x, y);
	ll t = x;
	x = y;
	y = t-a/b*y;
	return d;
}

void slove(){
	ll n, k;
	cin>>n>>k;
	ll len = n/k;
	ll len2 = n/k+1;
	ll t2 = n%k;
	ll t1 = n-n%k;
	ll a = len, b = len2;
	ll x, y;
	ll c = (n+1)/2;
	ll d = exgcd(a, b, x, y);
	if (c%d != 0) {
		cout<<"No"<<'\n'; 
	} else {
		a /= d, b /= d, c /= d;
		x *= c, y *= c;
		x = (x%b+b)%b;
		// ax <= c
		// a(x+b*k) <= c
		ll k = (c/a-x)/b;
		
		// x+b*k <= t1
		ll k2 = (t1-x)/b;
		x = min(k, k2) * b + x;
		if (x < 0) cout<<"No"<<'\n';
		else {
			y = (c-a*x)/b;
			if (0 <= y && y <= t2) {
				cout<<"Yes"<<'\n';
			} else {
				cout<<"No"<<'\n';
			}
		}
	}	
}
signed main(){
	ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	int T = 1;
	cin >> T;
	while(T--){
		slove();
	}
	return 0;
}



Details

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Test #1:

score: 100
Accepted
time: 0ms
memory: 3588kb

input:

3
3 1
4 2
5 3

output:

No
Yes
Yes

result:

ok 3 token(s): yes count is 2, no count is 1

Test #2:

score: -100
Wrong Answer
time: 13ms
memory: 3608kb

input:

100000
1 1
2 1
2 2
3 1
3 2
3 3
4 1
4 2
4 3
4 4
5 1
5 2
5 3
5 4
5 5
6 1
6 2
6 3
6 4
6 5
6 6
7 1
7 2
7 3
7 4
7 5
7 6
7 7
8 1
8 2
8 3
8 4
8 5
8 6
8 7
8 8
9 1
9 2
9 3
9 4
9 5
9 6
9 7
9 8
9 9
10 1
10 2
10 3
10 4
10 5
10 6
10 7
10 8
10 9
10 10
11 1
11 2
11 3
11 4
11 5
11 6
11 7
11 8
11 9
11 10
11 11
12 1
...

output:

Yes
No
Yes
No
Yes
Yes
No
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
Yes
No
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Y...

result:

wrong answer expected NO, found YES [31st token]