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Submission #969713

# Submission time Handle Problem Language Result Execution time Memory
969713 2024-04-25T13:33:19 Z Darren0724 Love Polygon (BOI18_polygon) C++17
29 / 100
 217 ms 11860 KB 
#include<bits/stdc++.h>
using namespace std;
const int N=100005;
map<string,int> m;
vector<int> vis(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;
        in[v[p]]--;
        if(in[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 Correct 1 ms 1624 KB Output is correct
2 Correct 1 ms 1628 KB Output is correct
3 Correct 1 ms 1628 KB Output is correct
4 Runtime error 2 ms 2908 KB Execution killed with signal 6
5 Halted 0 ms 0 KB -

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1624 KB Output is correct
2 Correct 1 ms 1628 KB Output is correct
3 Runtime error 2 ms 2908 KB Execution killed with signal 6
4 Halted 0 ms 0 KB -

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 217 ms 9608 KB Output is correct
2 Correct 198 ms 11636 KB Output is correct
3 Correct 174 ms 11604 KB Output is correct
4 Correct 1 ms 1628 KB Output is correct
5 Correct 203 ms 11576 KB Output is correct
6 Correct 208 ms 11604 KB Output is correct
7 Correct 202 ms 11644 KB Output is correct
8 Correct 184 ms 11636 KB Output is correct
9 Correct 194 ms 11860 KB Output is correct
10 Correct 164 ms 11848 KB Output is correct
11 Correct 1 ms 1628 KB Output is correct
12 Correct 1 ms 1880 KB Output is correct
13 Correct 1 ms 1628 KB Output is correct
14 Correct 1 ms 1628 KB Output is correct

Subtask #4
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1624 KB Output is correct
2 Correct 1 ms 1628 KB Output is correct
3 Correct 1 ms 1628 KB Output is correct
4 Runtime error 2 ms 2908 KB Execution killed with signal 6
5 Halted 0 ms 0 KB -