제출 #373061

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
373061		maozkurt	Kronican (COCI16_kronican)	C++17	0 / 100	119 ms	1008 KiB

kronican

#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <ctime>
#include <iostream>
#include <algorithm>
#include <queue>
#include <map>
#include <set>
#include <vector>
#include <string>
#include <stack>
#include <numeric>
#include <cassert>

#define endl '\n'
#define sp ' '

#define pb push_back
#define mp make_pair
#define ff first
#define ss second

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

const int maxn = 25;
const int inf = 1e9;
int c[maxn][maxn];

int popcount(int n){
    int ret = 0;
    for(int mask = 1;mask != (1<<maxn);mask<<=1){
        if(n&mask)
            ret++;
    }
    return ret;
}

int d[maxn][maxn];
int p[maxn][maxn];
void shortest(int n){
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            if(i==j) d[i][j] = 0;//inf;
            else d[i][j] = c[i][j];
            p[i][j] = j;
        }
    }
    for(int k=0;k<n;k++){
        for(int i=0;i<n;i++){
            for(int j=0;j<n;j++){
                if(d[i][j] > d[i][k] + d[k][j]){
                    d[i][j] = d[i][k] + d[k][j];
                    p[i][j] = p[i][k]; 
                }
            }
        }
    }
    /*for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            cerr << d[i][j] << sp;
        }
        cerr << endl;
    }*/
}

int main(){

    ios_base::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);cerr.tie(nullptr);
    int n,k;cin>>n>>k;
    vector<int> mask;
    for(int i=0;i<=(1<<n)-1;i++){
        if(popcount(i) == k)
            mask.pb(i);
    }
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            cin>>c[i][j];
        }
    }
    shortest(n);
    int ans = 1e9;
    int ansmask = 0;
    for(int m : mask){
        int curans = 0;
        int curm = m;
        int minm = 0;
        for(int a = 0;a<n;a++){
            if(!(m & (1<<a))){
                int bul = inf;//1e9;
                for(int b = 0;b<n;b++){
                    int curbul = 0;
                    if(m & (1<<b)){
                        //bul = min(bul,d[a][b]);
                        curm = m;
                        minm = 0;
                        int gez = a;
                        while(gez != b && !(m&(1<<gez))){
                            curbul += d[gez][p[gez][b]];
                            curm |= (1<<(gez));
                            gez = p[gez][b];
                        }

                        if(curbul < bul){
                            bul = curbul;
                            minm = curm;
                        }
                    }
                }
                assert(bul != 1e9);
                curans += bul;
                m |= minm;
                //if(m==18){
                //    cerr << a << sp <<sp << sp << bul << endl;
                //}
            }
        }
        if(curans < ans)
            ansmask = m;
        ans = min(curans,ans);
    }
    //cerr << bitset<8>(ansmask) << endl;
    assert(ans != 1e9); 
    cout << ans << endl;

}

컴파일 시 표준 에러 (stderr) 메시지

kronican.cpp: In function 'int main()':
kronican.cpp:88:9: warning: variable 'ansmask' set but not used [-Wunused-but-set-variable]
   88 |     int ansmask = 0;
      |         ^~~~~~~

• Subtask 1: 0 / 100