| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 388851 |
2021-04-13T07:29:23 Z |
huangqr |
Joker (BOI20_joker) |
C++14 |
|
2000 ms |
17520 KB |
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> pl;
typedef pair<ll,pl> ppl;
const ll lim=2e5+5;
ll par[lim],rnk[lim],rel[lim];
ll parcpy[lim],rnkcpy[lim];
pl findset(ll par[],ll x){
ll cur=0,og=x;
while(x!=par[x]){
if(rel[x])cur=1-cur;
x=par[x];
}
par[og]=x;
rel[og]=cur;
return {x,cur};
}
void mergeset(ll par[],ll rnk[],ll x,ll y){
pl px=findset(par,x),py=findset(par,y);
x=px.first,y=py.first;
if(x==y)return;
if(rnk[x]>rnk[y])swap(x,y);
if(rnk[x]==rnk[y])rnk[y]++;
par[x]=y;
rnk[y]++;
rel[x]=(px.second==py.second);
return;
}
int main(){
ios_base::sync_with_stdio(0),cin.tie(NULL);
ll n,m,q;
cin>>n>>m>>q;
for(int i=1;i<=n;i++)par[i]=i;
vector<pl>v;
vector<pl>qs[lim];
for(int i=0;i<m;i++){
ll a,b;
cin>>a>>b;
v.emplace_back(a,b);
}
//v.emplace_back(0,0);
bool ans[lim],cfa=0;
fill(ans,ans+lim,0);
for(int i=0;i<q;i++){
ll a,b;
cin>>a>>b;
b--,b++;//b is the minimum index that can be used on the right side
qs[b].emplace_back(a,i);
}
for(int i=m;i>=m;i--){
sort(qs[i].begin(),qs[i].end());
for(int i=1;i<=n;i++)parcpy[i]=par[i],rnkcpy[i]=rnk[i];
ll cur=0;
bool oddc=0;
for(auto x:qs[i]){
if(oddc==1){
ans[x.second]=1;
continue;
}
for(;cur+1<x.first;cur++){
pl x=findset(parcpy,v[cur].first),y=findset(parcpy,v[cur].second);
if(x.first==y.first){
if(x.second==y.second){
oddc=1;
}
}
else mergeset(parcpy,rnkcpy,v[cur].first,v[cur].second);
pl resx=findset(parcpy,v[cur].first),resy=findset(parcpy,v[cur].second);
}
ans[x.second]=oddc;
}
}
for(int i=m-1;i>=1;i--){
if(cfa==1){
for(auto x:qs[i])ans[x.second]=1;
continue;
}
pl x=findset(par,v[i].first),y=findset(par,v[i].second);
if(x.first==y.first){
if(x.second==y.second){
cfa=1;
}
}
else mergeset(par,rnk,v[i].first,v[i].second);
pl resx=findset(par,v[i].first),resy=findset(par,v[i].second);
if(qs[i].empty())continue;
if(cfa==1){
for(auto x:qs[i])ans[x.second]=1;
continue;
}
sort(qs[i].begin(),qs[i].end());
for(int i=1;i<=n;i++)parcpy[i]=par[i],rnkcpy[i]=rnk[i];
ll cur=0;
bool oddc=0;
for(auto x:qs[i]){
if(oddc==1){
ans[x.second]=1;
continue;
}
for(;cur+1<x.first;cur++){
pl x=findset(parcpy,v[cur].first),y=findset(parcpy,v[cur].second);
if(x.first==y.first){
if(x.second==y.second){
oddc=1;
}
}
else mergeset(parcpy,rnkcpy,v[cur].first,v[cur].second);
pl resx=findset(parcpy,v[cur].first),resy=findset(parcpy,v[cur].second);
}
ans[x.second]=oddc;
}
}
for(int i=0;i<q;i++){
if(ans[i])cout<<"YES\n";
else cout<<"NO\n";
}
return 0;
}
Compilation message
Joker.cpp: In function 'int main()':
Joker.cpp:72:8: warning: variable 'resx' set but not used [-Wunused-but-set-variable]
72 | pl resx=findset(parcpy,v[cur].first),resy=findset(parcpy,v[cur].second);
| ^~~~
Joker.cpp:72:42: warning: variable 'resy' set but not used [-Wunused-but-set-variable]
72 | pl resx=findset(parcpy,v[cur].first),resy=findset(parcpy,v[cur].second);
| ^~~~
Joker.cpp:116:8: warning: variable 'resx' set but not used [-Wunused-but-set-variable]
116 | pl resx=findset(parcpy,v[cur].first),resy=findset(parcpy,v[cur].second);
| ^~~~
Joker.cpp:116:42: warning: variable 'resy' set but not used [-Wunused-but-set-variable]
116 | pl resx=findset(parcpy,v[cur].first),resy=findset(parcpy,v[cur].second);
| ^~~~
Joker.cpp:91:6: warning: variable 'resx' set but not used [-Wunused-but-set-variable]
91 | pl resx=findset(par,v[i].first),resy=findset(par,v[i].second);
| ^~~~
Joker.cpp:91:35: warning: variable 'resy' set but not used [-Wunused-but-set-variable]
91 | pl resx=findset(par,v[i].first),resy=findset(par,v[i].second);
| ^~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
5196 KB |
Output is correct |
| 2 |
Correct |
3 ms |
5196 KB |
Output is correct |
| 3 |
Correct |
4 ms |
5196 KB |
Output is correct |
| 4 |
Correct |
3 ms |
5200 KB |
Output is correct |
| 5 |
Correct |
3 ms |
5160 KB |
Output is correct |
| 6 |
Incorrect |
4 ms |
5196 KB |
Output isn't correct |
| 7 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
5196 KB |
Output is correct |
| 2 |
Correct |
3 ms |
5196 KB |
Output is correct |
| 3 |
Correct |
4 ms |
5196 KB |
Output is correct |
| 4 |
Correct |
3 ms |
5200 KB |
Output is correct |
| 5 |
Correct |
3 ms |
5160 KB |
Output is correct |
| 6 |
Incorrect |
4 ms |
5196 KB |
Output isn't correct |
| 7 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
5196 KB |
Output is correct |
| 2 |
Correct |
3 ms |
5196 KB |
Output is correct |
| 3 |
Execution timed out |
2080 ms |
17520 KB |
Time limit exceeded |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
5196 KB |
Output is correct |
| 2 |
Correct |
3 ms |
5196 KB |
Output is correct |
| 3 |
Correct |
4 ms |
5196 KB |
Output is correct |
| 4 |
Correct |
3 ms |
5200 KB |
Output is correct |
| 5 |
Correct |
3 ms |
5160 KB |
Output is correct |
| 6 |
Incorrect |
4 ms |
5196 KB |
Output isn't correct |
| 7 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
5196 KB |
Output is correct |
| 2 |
Correct |
3 ms |
5196 KB |
Output is correct |
| 3 |
Correct |
4 ms |
5196 KB |
Output is correct |
| 4 |
Correct |
3 ms |
5200 KB |
Output is correct |
| 5 |
Correct |
3 ms |
5160 KB |
Output is correct |
| 6 |
Incorrect |
4 ms |
5196 KB |
Output isn't correct |
| 7 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
5196 KB |
Output is correct |
| 2 |
Correct |
3 ms |
5196 KB |
Output is correct |
| 3 |
Correct |
4 ms |
5196 KB |
Output is correct |
| 4 |
Correct |
3 ms |
5200 KB |
Output is correct |
| 5 |
Correct |
3 ms |
5160 KB |
Output is correct |
| 6 |
Incorrect |
4 ms |
5196 KB |
Output isn't correct |
| 7 |
Halted |
0 ms |
0 KB |
- |
