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Submission #1026917

# Submission time Handle Problem Language Result Execution time Memory
1026917 2024-07-18T13:41:53 Z 12345678 Love Polygon (BOI18_polygon) C++17
0 / 100
 644 ms 1048576 KB 
#include <bits/stdc++.h>

using namespace std;

const int nx=1e5+5;

int n, t, vs[nx], l[nx], res, cnt, lv[nx], used[nx];
string su[nx], sv[nx];
map<string, int> mp;
vector<int> d[nx];

void dfs(int u, int p)
{
    for (auto v:d[u]) if (v!=p) dfs(v, u);
    if (u!=p&&!used[u]&&!used[p]) res--, used[u]=used[p]=1; 
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n;
    res=n;
    for (int i=1; i<=n; i++) cin>>su[i]>>sv[i], mp[su[i]]=mp[sv[i]]=0;
    if (n%2) return cout<<-1, 0;
    for (auto &[x, y]:mp) y=++t;
    for (int i=1; i<=n; i++) 
    {
        l[mp[su[i]]]=mp[sv[i]];
        if (mp[su[i]]!=mp[sv[i]]) lv[mp[sv[i]]]=1, d[mp[su[i]]].push_back(mp[sv[i]]);
    }
    for (int i=1; i<=n; i++) if (!lv[i]) dfs(i, i);
    cout<<res;
}

Subtask #1
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 9048 KB Output is correct
2 Correct 2 ms 9052 KB Output is correct
3 Correct 2 ms 9052 KB Output is correct
4 Runtime error 644 ms 1048576 KB Execution killed with signal 9
5 Halted 0 ms 0 KB -

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 9048 KB Output is correct
2 Incorrect 3 ms 9048 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 29.0

# Verdict Execution time Memory Grader output
1 Incorrect 321 ms 23064 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 9048 KB Output is correct
2 Correct 2 ms 9052 KB Output is correct
3 Correct 2 ms 9052 KB Output is correct
4 Runtime error 644 ms 1048576 KB Execution killed with signal 9
5 Halted 0 ms 0 KB -