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Submission #1026898

# Submission time Handle Problem Language Result Execution time Memory
1026898 2024-07-18T13:16:53 Z 12345678 Love Polygon (BOI18_polygon) C++17
0 / 100
 156 ms 15180 KB 
#include <bits/stdc++.h>

using namespace std;

const int nx=1e5+5;

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

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>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]], lv[mp[sv[i]]]=1;
    for (int i=1; i<=n; i++)
    {
        if (lv[i]) continue;
        int sz=1, tmp=i;
        while (l[tmp]!=tmp) sz++, tmp=l[tmp];
        res+=sz/2;
        if (sz%2) res++;
    }
    cout<<res;
}

Subtask #1
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6748 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Incorrect 1 ms 6752 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 6748 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 29.0

# Verdict Execution time Memory Grader output
1 Incorrect 156 ms 15180 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6748 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Incorrect 1 ms 6752 KB Output isn't correct
4 Halted 0 ms 0 KB -