oj.uz

Submission #645235

# Submission time Handle Problem Language Result Execution time Memory
645235 2022-09-26T13:24:55 Z mychecksedad Love Polygon (BOI18_polygon) C++17
46 / 100
 286 ms 14760 KB 
/* Author : Mychecksdead */
#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef long double ld;
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define PI 3.1415926535
#define pb push_back
#define setp() cout << setprecision(15)
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " is " << x << '\n';
const int N = 1e6+100, M = 1e5+10, F = 2147483646, K = 20;

int n, to[N], res = 0;
string x, y;
vector<int> in(N);
map<string, int> s;
vector<bool> vis(N);

void dfs(int v, int d){
    vis[v] = 1;
    int u = to[v];
    if(vis[u]){
        if(d > 2) res += (d+1)/2;
        else if(d == 1) res++;
    }else dfs(u, d + 1);
}


void solve(){
    cin >> n;
    int c = 1;
    for(int i = 0; i < n; ++i){
        cin >> x >> y;
        if(s[x] == 0) s[x] = c++;
        if(s[y] == 0) s[y] = c++;
        int a = s[x] - 1, b = s[y] - 1;
        to[a] = b;
    }
    if(n&1){
        cout << -1;
        return;
    }
    if(n <= 20){
        int ans = n;
        for(int mask = 0; mask < (1<<n); ++mask){

            bool ok = 1;
            vector<int> v;

            for(int j = 0; j < n; ++j){
                if(!((1<<j)&mask)){
                    v.pb(to[j]);
                    if(to[j] == j) ok = 0;
                    else if(!(to[to[j]] == j || ((1<<to[j])&mask))) ok = 0;
                }
            }
            sort(all(v));
            
            for(int j = 0; j < int(v.size()) - 1; ++j) if(v[j] == v[j + 1]) ok = 0;
            

            if(ok){
                if(ans > __builtin_popcount(mask)){
                    ans = __builtin_popcount(mask);
                }
            }
        }
        cout << ans;
        return;
    }

    for(int i = 0; i < n; ++i) if(!vis[i]) dfs(i, 1);
    cout << res;
}





int main(){
    cin.tie(0); ios::sync_with_stdio(0);
    int T = 1, aa;
    // cin >> T;aa=T;
    while(T--){
        // cout << "Case #" << aa-T << ": ";
        solve();
        cout << '\n';
    }
    return 0;
 
}

Compilation message

polygon.cpp: In function 'int main()':
polygon.cpp:84:16: warning: unused variable 'aa' [-Wunused-variable]
   84 |     int T = 1, aa;
      |                ^~

Subtask #1
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 257 ms 4308 KB Output is correct
2 Correct 229 ms 4308 KB Output is correct
3 Correct 270 ms 4308 KB Output is correct
4 Correct 2 ms 4308 KB Output is correct
5 Correct 3 ms 4308 KB Output is correct
6 Correct 2 ms 4308 KB Output is correct
7 Correct 267 ms 4308 KB Output is correct
8 Correct 283 ms 4308 KB Output is correct
9 Correct 263 ms 4308 KB Output is correct
10 Correct 275 ms 4308 KB Output is correct
11 Correct 286 ms 4308 KB Output is correct
12 Correct 2 ms 4308 KB Output is correct
13 Correct 2 ms 4308 KB Output is correct
14 Correct 2 ms 4308 KB Output is correct
15 Correct 2 ms 4308 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4308 KB Output is correct
2 Correct 2 ms 4308 KB Output is correct
3 Correct 2 ms 4308 KB Output is correct
4 Correct 172 ms 12564 KB Output is correct
5 Correct 199 ms 14728 KB Output is correct
6 Correct 200 ms 14760 KB Output is correct
7 Correct 182 ms 14612 KB Output is correct

Subtask #3
0 / 29.0

# Verdict Execution time Memory Grader output
1 Incorrect 168 ms 12508 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 257 ms 4308 KB Output is correct
2 Correct 229 ms 4308 KB Output is correct
3 Correct 270 ms 4308 KB Output is correct
4 Correct 2 ms 4308 KB Output is correct
5 Correct 3 ms 4308 KB Output is correct
6 Correct 2 ms 4308 KB Output is correct
7 Correct 267 ms 4308 KB Output is correct
8 Correct 283 ms 4308 KB Output is correct
9 Correct 263 ms 4308 KB Output is correct
10 Correct 275 ms 4308 KB Output is correct
11 Correct 286 ms 4308 KB Output is correct
12 Correct 2 ms 4308 KB Output is correct
13 Correct 2 ms 4308 KB Output is correct
14 Correct 2 ms 4308 KB Output is correct
15 Correct 2 ms 4308 KB Output is correct
16 Correct 2 ms 4308 KB Output is correct
17 Correct 2 ms 4308 KB Output is correct
18 Correct 2 ms 4308 KB Output is correct
19 Correct 172 ms 12564 KB Output is correct
20 Correct 199 ms 14728 KB Output is correct
21 Correct 200 ms 14760 KB Output is correct
22 Correct 182 ms 14612 KB Output is correct
23 Incorrect 168 ms 12508 KB Output isn't correct
24 Halted 0 ms 0 KB -