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Submission #969707

# Submission time Handle Problem Language Result Execution time Memory
969707 2024-04-25T13:30:31 Z Darren0724 Love Polygon (BOI18_polygon) C++17
0 / 100
 209 ms 21840 KB 
#include<bits/stdc++.h>
using namespace std;
const int N=100005;
map<string,int> m;
vector<int> vis(N),deg(N);
vector<int> v(N,-1),in(N);
inline int id(string s){
    if(m.count(s)){
        return m[s];
    }
    int p=m.size();
    m[s]=p;
    return p;
}
int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n;cin>>n;
    if(n&1){
        cout<<-1<<endl;
        return 0;
    }
    for(int i=0;i<n;i++){
        string a,b;cin>>a>>b;
        v[id(a)]=id(b);
        in[id(b)]++;
        if(v[id(b)]==id(a)&&a!=b){
            vis[id(a)]=vis[id(b)]=1; 
        }
    }
    int ans=0;
    queue<int> q;
    for(int i=0;i<n;i++){
        if(in[i]==0){
            q.push(i);
        }
    }
    while(q.size()){
        int p=q.front();
        q.pop();
        //cout<<p<<endl;
        deg[v[p]]--;
        if(deg[v[p]]==0){
            q.push(v[p]);
        }
        if(vis[p]||vis[v[p]]){
            continue;
        }
        ans++;
        vis[p]=vis[v[p]]=1;
    }
    for(int i=0;i<n;i++){
        if(vis[i])continue;
        int sz=0,f=i;
        while(vis[f]==0){
            sz++;
            vis[f]=1;
            f=v[f];
        }
        assert(sz==1);
        ans+=(sz+1)/2;
    }
    cout<<ans<<endl;
 
    return 0;
}

Subtask #1
0 / 21.0

# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 3828 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1884 KB Output is correct
2 Correct 1 ms 2036 KB Output is correct
3 Runtime error 3 ms 3676 KB Execution killed with signal 6
4 Halted 0 ms 0 KB -

Subtask #3
0 / 29.0

# Verdict Execution time Memory Grader output
1 Runtime error 209 ms 21840 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #4
0 / 25.0

# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 3828 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -