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Submission #311487

# Submission time Handle Problem Language Result Execution time Memory
311487 2020-10-10T13:04:08 Z OttoTheDino Love Polygon (BOI18_polygon) C++17
29 / 100
 288 ms 11572 KB 
#include <bits/stdc++.h>
using namespace std;

#define rep(n)      for (int i = 0; i < n; ++i)
#define rep2(n)     for (int j = 0; j < n; ++j)
#define mp          make_pair
#define pb          push_back
typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> ii;

const int maxn = 2e5;

int loves[maxn];
bool been[maxn] = {};

int dfs (int i) {
    been[i] = 1;
    return 1+(been[loves[i]]?0:(loves[i]));
}


int main() {    
    ios::sync_with_stdio(0);
    cin.tie(0);
    
    map<string, int> decode;
    int n, num = 1, loved[maxn], ans = 0;
    string s, t;
    cin >> n;
    
    if (n%2==1) {
        cout << "-1\n";
        return 0;
    }
    
    rep (n) {
        cin >> s >> t;
        if (!decode[s]) decode[s] = num++;
        if (!decode[t]) decode[t] = num++;
        loves[decode[s]] = decode[t];
        loved[decode[t]]++;
    }
    
    queue<int> q;
    
    for (int i = 1; i <= n; ++i) {
        if (i==loves[loves[i]] && loves[i]!=i) {
            been[i] = 1;
            been[loves[i]] = 1;
        }
        else if (loved[i]==0) q.push(i);
    }
    
    while (!q.empty()) {
        int id = q.front();
        q.pop();
        been[id] = 1;
        if (!been[loves[id]]) {
            been[loves[id]] = 1;
            if (--loved[loves[loves[id]]]==0) q.push(loves[loves[id]]);
        }
        ans++;
    }
    
    for (int i = 1; i <= n; ++i) {
        if (!been[i]) ans += (dfs(i)+1)/2;
    }
    
    cout << ans << "\n";
    
    return 0;
}

Subtask #1
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Incorrect 1 ms 384 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Incorrect 0 ms 384 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 288 ms 11436 KB Output is correct
2 Correct 287 ms 11384 KB Output is correct
3 Correct 228 ms 11256 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 273 ms 11384 KB Output is correct
6 Correct 259 ms 11384 KB Output is correct
7 Correct 265 ms 11516 KB Output is correct
8 Correct 250 ms 11468 KB Output is correct
9 Correct 252 ms 11572 KB Output is correct
10 Correct 199 ms 11384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 0 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct

Subtask #4
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Incorrect 1 ms 384 KB Output isn't correct
8 Halted 0 ms 0 KB -