oj.uz

Submission #862802

# Submission time Handle Problem Language Result Execution time Memory
862802 2023-10-19T04:12:08 Z maks007 Love Polygon (BOI18_polygon) C++14
0 / 100
 161 ms 11196 KB 
//Bismi Allah
#include "bits/stdc++.h"

using namespace std;

signed main () {
	ios::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	int n, ans = 1e9;
	cin >> n;
	vector <int> who(n, -1), used(n, 0);
	map <string,int> mp;
	// function<void(int,int)> f=[&](int v, int cnt) {
	// 	used[v]=1;
	// 	if(count(used.begin(), used.end(), 1) == used.size()) {
	// 		ans = min(ans, cnt);
	// 		used[v]=0;
	// 		return;
	// 	}
	// 	for(int i = 0; i < used.size(); i ++) {
	// 		if(used[i]) continue;
	// 		if(who[i] == v && who[v] == i) {

	// 		}
	// 	}
	// 	used[v]=0;
	// };
	int cnt = 0;
	for(int i = 0; i < n; i ++) {
		string u, v;
		cin >> u >> v;
		if(mp.count(u) == 0) mp[u] = mp.size();
		if(mp.count(v) == 0) mp[v] = mp.size();
		if(mp[u] == mp[v]) cnt ++;
		who[mp[v]] = mp[u];
	}
	if(n % 2 == 1) {
		cout << "-1";
		return 0;
	}
	cout << cnt+(n-cnt)/2;
	return 0;
}

Compilation message

polygon.cpp: In function 'int main()':
polygon.cpp:9:9: warning: unused variable 'ans' [-Wunused-variable]
    9 |  int n, ans = 1e9;
      |         ^~~

Subtask #1
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Incorrect 0 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Incorrect 0 ms 460 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 29.0

# Verdict Execution time Memory Grader output
1 Incorrect 161 ms 11196 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Incorrect 0 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -