Submission #167171

#	Time	Username	Problem	Language	Result	Execution time	Memory
167171		egekabas	Kronican (COCI16_kronican)	C++14	10 / 100	233 ms	404 KiB

kronican

#include <bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
using namespace std;
typedef long long   ll;
typedef unsigned long long   ull;
typedef long double ld;
typedef pair<ll, ll>    pll;
typedef pair<ull, ull>    pull;
typedef pair<ll, ll>  pii;
typedef pair<ld, ld>  pld;
ll val[25][25];
vector<pair<ll, pii>> v;
ll n, k;
ll prt[25];
ll find(ll x){
    if(prt[x] == x)
        return x;
    return prt[x] = find(prt[x]);
}
ll merge(ll x, ll y){
    x = find(x);
    y = find(y);
    prt[x] = y;
}
ll bitcnt(ll x){
    ll ret = 0;
    while(x > 0){
        ret += x%2;
        x /= 2;
    }
    return ret;
}
ll f(ll bit){
    ll ret = 0;
    for(ll i = 0; i < n; ++i)
        prt[i] = i;
    ll root = -1; 
    for(ll i = 0; i < n; ++i){
        if((bit&(1<<i)) == 0)
            continue;
        if(root == -1)
            root = i;
        else
            merge(root, i);
    }
    for(auto u : v){
        if(find(u.ss.ff) != find(u.ss.ss)){
            ret += u.ff;
            merge(u.ss.ff, u.ss.ss);
        }
    }
    return ret;
}
ll sfunc(pair<ll, pii> a, pair<ll, pii> b){return a.ff < b.ff;}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    
    //freopen("in.txt", "r", stdin);
    //freopen("out.txt", "w", stdout);
    
    cin >> n >> k;
    for(ll i = 0; i < n; ++i)
        for(ll j = 0; j < n; ++j){
            cin >> val[i][j];
            v.pb({val[i][j], {i, j}});
        }
    sort(v.begin(), v.end(), sfunc);
    ll ans = 1e9;
    for(ll i = 0; i < (1<<n); ++i){
        if(bitcnt(i) == k){
            ans = min(ans, f(i));
            //cout << i << " " << f(i) << "\n";
        }
    }
    cout << ans << "\n";
}

Compilation message (stderr)

kronican.cpp: In function 'll merge(ll, ll)':
kronican.cpp:27:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

• Subtask 1: 10 / 100