Submission #393288

#	Time	Username	Problem	Language	Result	Execution time	Memory
393288		jainbot27	Love Polygon (BOI18_polygon)	C++17	21 / 100	432 ms	4432 KiB

polygon

#include <bits/stdc++.h>
using namespace std;

#define f first
#define s second
#define pb push_back
#define ar array
#define all(x) x.begin(), x.end()
#define siz(x) (int) x.size()
#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)

#define FOR(i, a, b) for(int i=(a); i<(b); i++)
#define ROF(i, a, b) for(int i=(b-1); i>=(a); i--)
#define F0R(i, n) FOR(i, 0, n)
#define R0F(i, n) ROF(i, 0, n)
#define trav(x, y) for(auto&x:y)

using ll=long long;
using ld=long double;
using pii=pair<int, int>;
using pll=pair<ll, ll>;
using pli=pair<ll, int>;
using vi=vector<int>;
using vl=vector<ll>;
using vpii=vector<pii>;

template<class T> inline bool ckmin(T&a, const T&b) {return b<a?a=b,1:0;}
template<class T> inline bool ckmax(T&a, const T&b) {return b>a?a=b,1:0;}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const char nl='\n';
const int mxN=20;
const int MOD=1e9+7;
const ll infLL=1e18;
const ld eps=1e-6;

int a[mxN];
map<string, int> mp;
string s[mxN], t[mxN];
int dp[1<<mxN];

int32_t main(){
    cin.tie(0)->sync_with_stdio(0);
    int n;
    cin >> n;
    if(n&1) {
        cout << "-1\n";
        return 0;
    }
    F0R(i, n)
        cin >> s[i] >> t[i], mp[s[i]]=i;
    F0R(i, n){
        a[i]=mp[t[i]];
        // cout << a[i] << nl;
    }    
    memset(dp, 0x3f, sizeof dp);
    dp[0]=0;
    F0R(i, 1<<n){
        if(__builtin_popcount(i)&1) continue;
        F0R(j, n) F0R(k, n){
            if(((1<<j)&i)||((1<<k)&i)) continue;
            ckmin(dp[i|(1<<j)|(1<<k)], dp[i]+(a[j]!=k)+(a[k]!=j));
        }
    }
    cout<<dp[(1<<n)-1]<<nl;
}

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