Submission #485463

#	Time	Username	Problem	Language	Result	Execution time	Memory
485463		sam571128	Love Polygon (BOI18_polygon)	C++17	21 / 100	696 ms	20024 KiB

polygon

#include <bits/stdc++.h>

#define int long long
#define fastio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;

int idx;
map<string,int> m;

int assign(string x){
    if(m.find(x)==m.end()){
        m[x] = idx++;
    }
    return m[x];
}

signed main(){
    fastio
    int n;
    cin >> n;
    int arr[n];

    for(int i = 0;i < n;i++){
        string a,b;
        cin >> a >> b;
        int x = assign(a);
        int y = assign(b);
        arr[x] = y;
    }

    if(n%2){
        cout << -1 << "\n";
        return 0;
    }

    int dp[1<<n];
    fill(dp,dp+(1<<n),1e18);
    dp[0] = 0;

    for(int mask = 0;mask < (1<<n); mask++){
        for(int i = 0;i < n;i++){
            if(mask&(1<<i)) continue;
            for(int j = 0;j < n;j++){
                if(i==j||mask&(1<<j)) continue;
                dp[mask|(1<<i)|(1<<j)] = min(dp[mask]+(arr[i]!=j)+(arr[j]!=i),dp[mask|(1<<i)|(1<<j)]);
            }
        }
    }

    cout << dp[(1<<n)-1] << "\n";
}   

• Subtask 1: 21 / 21
• Subtask 2: 0 / 25
• Subtask 3: 0 / 29
• Subtask 4: 0 / 25