QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#614005 | #9449. New School Term | ucup-team5071# | WA | 0ms | 3836kb | C++20 | 1.4kb | 2024-10-05 15:18:54 | 2024-10-05 15:20:49 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
const int maxn=5010*2;
int f[maxn];
int siz[maxn][2];
int n,m;
int getf(int x){
if(x<0)return -getf(-x);
if(x==f[x])return x;
else return f[x]=getf(f[x]);
}
bool merge(int x,int y){//如果是x!=y将y取反(x>0 y>0)
if(getf(x)==-getf(y))return false;
if(getf(x)==getf(y))return true;
x=getf(x),y=getf(y);
if(x<0)x=-x,y=-y;
if(siz[x][0]+(y>0?siz[y][0]:siz[-y][1])>n)return false;
if(siz[x][1]+(y>0?siz[y][1]:siz[-y][0])>n)return false;
f[x]=y;
if(y>0)siz[y][0]+=siz[x][0],siz[y][1]+=siz[x][1];
else siz[-y][0]+=siz[x][1],siz[-y][1]+=siz[x][0];
return true;
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
cin>>n>>m;
for(int i=1;i<=n*2;i++)f[i]=i,siz[i][0]=1;
vector<int> ans(n*2+1,0);
vector<pair<int,int>> q(m);
for(int i=0;i<m;i++){
cin>>q[i].first>>q[i].second;
}
reverse(q.begin(),q.end());
for(auto [x,y]:q){
bool flag=merge(x,-y);
if(!flag)merge(x,y);
// cout<<"x="<<x<<" y="<<y<<" merge="<<flag<<endl;
}
// for(int i=1;i<=n;i++)cout<<
vector<int> vis(n*2+1,0);
for(int i=1;i<=n*2;i++)if(!vis[i]){
for(int j=i+1;j<=n*2;j++)if(abs(getf(i))==abs(getf(j))){
if(getf(i)==-getf(j))ans[j]=ans[i]^1;
else ans[j]=ans[i];
vis[j]=1;
}
}
for(int i=1;i<=n*2;i++)cout<<ans[i];
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3548kb
input:
2 4 1 3 2 4 1 4 1 2
output:
0101
result:
ok Output is valid. OK
Test #2:
score: 0
Accepted
time: 0ms
memory: 3832kb
input:
3 7 2 5 1 3 4 6 2 6 4 5 2 4 5 6
output:
001101
result:
ok Output is valid. OK
Test #3:
score: -100
Wrong Answer
time: 0ms
memory: 3836kb
input:
1 0
output:
00
result:
wrong answer The number of 0s must be equal to that of 1s.