oj.uz

Submission #871820

# Submission time Handle Problem Language Result Execution time Memory
871820 2023-11-11T16:17:57 Z 1075508020060209tc Tug of War (BOI15_tug) C++14
0 / 100
 344 ms 30812 KB 
//#pragma GCC optimize ("O3")
#include<bits/stdc++.h>
//#include <bits/extc++.h>
//using namespace __gnu_pbds;
using namespace std;
//#define int long long
#define X first
#define Y second
int lowbit(int x){return x&-x;}
int n;int K;
vector<int>e[500005];
int vis[500005];
int vise[500005];
int dgr[500005];
int ar[500005];int br[500005];int cr[500005];
int basea;
int baseb;
bitset<600005>dp;
bitset<600005>dp2;
bitset<600005>zer;
int tota;int totb;
int tp;
void dfs(int nw){
vis[nw]=1;
//cout<<nw<<"kk"<<endl;
int cnt=0;
for(int i=0;i<e[nw].size();i++){
    int id=e[nw][i];
    if(vise[id]){continue;}
    int v=nw^ar[id]^br[id];
    if(tp==0){
        tota+=cr[id];
    }else{
        totb+=cr[id];
    }
    vise[id]=1;

    tp^=1;
    cnt++;
 //   if(vis[v]){continue;}
    dfs(v);
}return;
if(cnt>=2){
    exit(cnt);
}

}

int uf[500005];
int usz[500005];
int ues[500005];

int fin(int x){
if(uf[x]==x){return x;}
uf[x]=fin(uf[x]);
return uf[x];
}
void mrg(int a,int b){
int pa=fin(a);int pb=fin(b);
ues[pa]++;
if(pa==pb){return;}
usz[pa]+=usz[pb];
ues[pa]+=ues[pb];
uf[pb]=pa;
}


signed main(){
cin.tie(0);
ios_base::sync_with_stdio(0);    

cin>>n>>K;
int ftot=0;
for(int i=1;i<=n+n;i++){
    int a;int b;int c;
    cin>>a>>b>>c;
    b+=n;
    ar[i]=a;br[i]=b;cr[i]=c;
    ftot+=c;
    dgr[a]++;
    dgr[b]++;
    e[a].push_back(i);
    e[b].push_back(i);
}

for(int i=1;i<=n+n;i++){
    if(dgr[i]==0){
        cout<<"NO\n";return 0;
    }
}

for(int i=1;i<=n+n;i++){
    uf[i]=i;
    usz[i]=1;
    ues[i]=0;
}
for(int i=1;i<=n+n;i++){
    //if(vise[i]){continue;}
    mrg(ar[i],br[i]);
}
for(int i=1;i<=n+n;i++){
    //if(vis[i]){continue;}
    if( usz[fin(i)]!=ues[fin(i)] ){
        cout<<"NO\n";return 0;
    }
}


queue<int>q;
for(int i=1;i<=n+n;i++){
    if(dgr[i]==1){
        q.push(i);
        vise[e[i][0]]=1;
        if( i<=n ){
            basea+=cr[e[i][0]];
        }
        vis[i]=1;
    }
}
while(q.size()){
    int nw=q.front();
    q.pop();
    vis[nw]=1;
    for(int i=0;i<e[nw].size();i++){
        int id=e[nw][i];
        if(vise[id]){continue;}
        int v=ar[id]^br[id]^nw;
        dgr[v]--;
        if(dgr[v]==1){
            for(int j=0;j<e[v].size();j++){
                int idd=e[v][j];
                if(vise[idd]){continue;}
                if(v<=n){
                    basea+=cr[idd];
                }
                vise[idd]=1;
            }
            q.push(v);
        }
    }
}/*
cout<<basea<<"\n";
for(int i=1;i<=n+n;i++){
    cout<<vis[i]<<" ";
}cout<<endl;
for(int i=1;i<=n+n;i++){
    cout<<vise[i]<<" ";
}*/

for(int i=1;i<=n+n;i++){
    if(dgr[i]>=3){
        cout<<"NO\n";return 0;
    }
}

vector<pair<int,int>>vc;

for(int i=1;i<=n;i++){
    if(vis[i]){continue;}
    tota=0;
    totb=0;
    tp=0;
    dfs(i);
    vc.push_back({tota,totb});
}
dp[basea]=1;
for(int i=0;i<vc.size();i++){
    dp2=(dp<<vc[i].first);
    dp2=(dp2|(dp<<vc[i].second));
    swap(dp,dp2);
    dp2=zer;
}
for(int i=0;i<=n*20;i++){
    if(dp[i]&&(abs(ftot-i-i)<=K)){
        cout<<"YES\n";return 0;
    }
}
cout<<"NO\n";

}

Compilation message

tug.cpp: In function 'void dfs(int)':
tug.cpp:27:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 | for(int i=0;i<e[nw].size();i++){
      |             ~^~~~~~~~~~~~~
tug.cpp: In function 'int main()':
tug.cpp:124:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  124 |     for(int i=0;i<e[nw].size();i++){
      |                 ~^~~~~~~~~~~~~
tug.cpp:130:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  130 |             for(int j=0;j<e[v].size();j++){
      |                         ~^~~~~~~~~~~~
tug.cpp:167:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  167 | for(int i=0;i<vc.size();i++){
      |             ~^~~~~~~~~~

Subtask #1
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 25948 KB Output is correct
2 Correct 6 ms 25944 KB Output is correct
3 Correct 5 ms 25944 KB Output is correct
4 Correct 5 ms 25948 KB Output is correct
5 Correct 5 ms 25944 KB Output is correct
6 Correct 5 ms 25948 KB Output is correct
7 Correct 5 ms 25948 KB Output is correct
8 Correct 5 ms 25948 KB Output is correct
9 Correct 5 ms 25948 KB Output is correct
10 Correct 5 ms 25948 KB Output is correct
11 Correct 5 ms 26036 KB Output is correct
12 Correct 5 ms 25948 KB Output is correct
13 Correct 5 ms 25948 KB Output is correct
14 Correct 5 ms 25948 KB Output is correct
15 Correct 5 ms 25948 KB Output is correct
16 Correct 5 ms 25948 KB Output is correct
17 Correct 5 ms 25948 KB Output is correct
18 Correct 5 ms 26056 KB Output is correct
19 Correct 5 ms 25948 KB Output is correct
20 Correct 5 ms 25944 KB Output is correct
21 Correct 4 ms 21848 KB Output is correct
22 Incorrect 5 ms 30044 KB Output isn't correct
23 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 25948 KB Output is correct
2 Correct 6 ms 25944 KB Output is correct
3 Correct 5 ms 25944 KB Output is correct
4 Correct 5 ms 25948 KB Output is correct
5 Correct 5 ms 25944 KB Output is correct
6 Correct 5 ms 25948 KB Output is correct
7 Correct 5 ms 25948 KB Output is correct
8 Correct 5 ms 25948 KB Output is correct
9 Correct 5 ms 25948 KB Output is correct
10 Correct 5 ms 25948 KB Output is correct
11 Correct 5 ms 26036 KB Output is correct
12 Correct 5 ms 25948 KB Output is correct
13 Correct 5 ms 25948 KB Output is correct
14 Correct 5 ms 25948 KB Output is correct
15 Correct 5 ms 25948 KB Output is correct
16 Correct 5 ms 25948 KB Output is correct
17 Correct 5 ms 25948 KB Output is correct
18 Correct 5 ms 26056 KB Output is correct
19 Correct 5 ms 25948 KB Output is correct
20 Correct 5 ms 25944 KB Output is correct
21 Correct 4 ms 21848 KB Output is correct
22 Incorrect 5 ms 30044 KB Output isn't correct
23 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 334 ms 27032 KB Output is correct
2 Correct 10 ms 22360 KB Output is correct
3 Correct 329 ms 27036 KB Output is correct
4 Correct 9 ms 22360 KB Output is correct
5 Correct 336 ms 27052 KB Output is correct
6 Correct 9 ms 22360 KB Output is correct
7 Correct 344 ms 26968 KB Output is correct
8 Correct 8 ms 22360 KB Output is correct
9 Correct 334 ms 27104 KB Output is correct
10 Correct 9 ms 22364 KB Output is correct
11 Correct 331 ms 26972 KB Output is correct
12 Correct 9 ms 22360 KB Output is correct
13 Correct 324 ms 27036 KB Output is correct
14 Correct 343 ms 26968 KB Output is correct
15 Correct 10 ms 22680 KB Output is correct
16 Correct 333 ms 27036 KB Output is correct
17 Correct 9 ms 22364 KB Output is correct
18 Correct 329 ms 27140 KB Output is correct
19 Correct 8 ms 22360 KB Output is correct
20 Correct 333 ms 26968 KB Output is correct
21 Correct 9 ms 22364 KB Output is correct
22 Incorrect 10 ms 30812 KB Output isn't correct
23 Halted 0 ms 0 KB -

Subtask #4
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 25948 KB Output is correct
2 Correct 6 ms 25944 KB Output is correct
3 Correct 5 ms 25944 KB Output is correct
4 Correct 5 ms 25948 KB Output is correct
5 Correct 5 ms 25944 KB Output is correct
6 Correct 5 ms 25948 KB Output is correct
7 Correct 5 ms 25948 KB Output is correct
8 Correct 5 ms 25948 KB Output is correct
9 Correct 5 ms 25948 KB Output is correct
10 Correct 5 ms 25948 KB Output is correct
11 Correct 5 ms 26036 KB Output is correct
12 Correct 5 ms 25948 KB Output is correct
13 Correct 5 ms 25948 KB Output is correct
14 Correct 5 ms 25948 KB Output is correct
15 Correct 5 ms 25948 KB Output is correct
16 Correct 5 ms 25948 KB Output is correct
17 Correct 5 ms 25948 KB Output is correct
18 Correct 5 ms 26056 KB Output is correct
19 Correct 5 ms 25948 KB Output is correct
20 Correct 5 ms 25944 KB Output is correct
21 Correct 4 ms 21848 KB Output is correct
22 Incorrect 5 ms 30044 KB Output isn't correct
23 Halted 0 ms 0 KB -