oj.uz

답안 #890881

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
890881 2023-12-22T04:51:14 Z vjudge1 Jail (JOI22_jail) C++17
0 / 100
 2 ms 13404 KB 
#include <bits/stdc++.h>
#define int long long
#define all(x) x.begin(),x.end()
#define ff first
#define ss second
#define pb push_back
using namespace std;
const int N=120005;
vector <int> g[N];
int d[N],p[N];
int jmp[20][N];
void dfs(int v,int par){
    p[v]=par;
    for(auto to : g[v]){
        if(to!=par){
            d[to]=d[v]+1;
            dfs(to,v);
        }
    }
}
int lca(int a,int b){
    if(d[a]<d[b]){
        swap(a,b);
    }
    int curv=a,curu=b;
    for(int j=19;j>=0;j--){
        if(d[jmp[curv][j]]>=d[curu]){
            curv=jmp[curv][j];
        }
    }
    if(curv==curu){
        return curv;
    }
    for(int j=19;j>=0;j--){
        if(jmp[curv][j]!=jmp[curu][j]){
            curv=jmp[curv][j];
            curu=jmp[curu][j];
        }
    }
    return p[curv];
}
signed main(){
    ios_base::sync_with_stdio();
    cin.tie(0);
    int t;cin>>t;
    while(t--){
        
        
        int n;cin>>n;
        for(int i=0;i<n-1;i++){
            int u,v;cin>>u>>v;
            g[u].pb(v);
            g[v].pb(u);
        }
        
        dfs(1,0);
        p[1]=1;
        for(int i=1;i<=n;i++){
            jmp[i][0]=p[i];
        }
        for(int j=1;j<20;j++){
            for(int i=1;i<=n;i++){
                jmp[i][j]=jmp[jmp[i][j-1]][j-1];
            }
        }
        
        int m;cin>>m;
        vector <int> s(m),t(m);
        vector <vector <int> > path(m);
        for(int i=0;i<m;i++)cin>>s[i]>>t[i];
        for(int i=0;i<m;i++){
            int x=lca(s[i],t[i]);
            int curv=s[i];
            path[i].pb(curv);
            while(curv!=x){
                curv=p[curv];
                path[i].pb(curv);
            }
            path[i].pop_back();
            vector <int> v;
            curv=t[i];
            v.pb(curv);
            while(curv!=x){
                curv=p[curv];
               v.pb(curv);
            }
            reverse(all(v));
            for(auto x : v)path[i].pb(x);
            while(path[i].size()!=n)path[i].pb(path[i].back());
        }
        bool flag=true;
        for(int i=0;i<n;i++){
            set <int> st;
            for(int j=0;j<m;j++){
                st.insert(path[j][i]);
            }
            if(st.size()!=m){
                flag=false;break;
            }
        }
        if(flag)cout<<"Yes\n";
        else cout<<"No\n";
        
        
        for(int i=1;i<=n;i++){
            g[i].clear();
            d[i]=0;p[i]=0;
            for(int j=0;j<20;j++){
                jmp[i][j]=0;
            }
        }
    }
}

Compilation message

jail.cpp: In function 'int main()':
jail.cpp:89:33: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   89 |             while(path[i].size()!=n)path[i].pb(path[i].back());
      |                   ~~~~~~~~~~~~~~^~~
jail.cpp:97:25: warning: comparison of integer expressions of different signedness: 'std::set<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   97 |             if(st.size()!=m){
      |                ~~~~~~~~~^~~

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 13404 KB Output is correct
2 Correct 2 ms 13404 KB Output is correct
3 Incorrect 1 ms 7260 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 13400 KB Output is correct
2 Incorrect 2 ms 7260 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 13400 KB Output is correct
2 Incorrect 2 ms 7260 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 28.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 13400 KB Output is correct
2 Incorrect 2 ms 7260 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 13400 KB Output is correct
2 Incorrect 2 ms 7260 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 13404 KB Output is correct
2 Correct 2 ms 13404 KB Output is correct
3 Correct 2 ms 13404 KB Output is correct
4 Incorrect 2 ms 7260 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 13404 KB Output is correct
2 Correct 2 ms 13404 KB Output is correct
3 Incorrect 1 ms 7260 KB Output isn't correct
4 Halted 0 ms 0 KB -