QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#372079 | #5141. Identical Parity | Siilhouette | WA | 12ms | 3660kb | C++14 | 1.3kb | 2024-03-30 21:06:36 | 2024-03-30 21:06:37 |
Judging History
answer
#define _CRT_SECURE_NO_WARNINGS
#include<queue>
#include<cmath>
#include<string>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;
typedef long long ll;
const int mod=1e9+7;
const int N=2e5+10;
inline ll exgcd(ll a,ll b,ll &x,ll &y)
{
if(b==0)return x=1,y=0,a;
ll d=exgcd(b,a%b,y,x);
y-=a/b*x;
return d;
}
inline bool sol(ll a,ll b,ll m,ll R1,ll R2) //cal ax+by=m (0<=x<=R1)(0<=y<=R2)
{
ll x,y;
ll d=exgcd(a,b,x,y);
if(m%d)return 0;
a/=d;
b/=d;
m/=d;
ll xx=(ll)x*(m%b)%b;
if(xx<0) xx=xx+b;
ll yy=(ll)(m-a*xx)/b;
if(yy<0||xx>R1)
return 0;
else
{
if(0<=xx&&xx<=R1&&0<=yy&&yy<=R2)return 1;
else
{
ll l1=-xx*a,r1=(R1-xx)*a;
ll l2=-(R2-yy)*b,r2=yy*b;
ll l=max(l1,l2),r=min(r1,r2);
ll ab=a*b;
if(l>r)return 0;
else if(r/ab>0&&r/ab*ab>=l)return 1;
else return 0;
}
}
}
int main()
{
ios::sync_with_stdio(false); cin.tie(nullptr),cout.tie(nullptr);
int t;
cin>>t;
while(t--)
{
ll n,k;
cin>>n>>k;
ll a=n/k+1,b=n/k,m=(n+1)/2,x,y;
puts(sol(a,b,m,n%k,n-(n%k))?"YES":"NO");
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 1ms
memory: 3596kb
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: 12ms
memory: 3660kb
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]