HDU4712+随机算法

随机算法

求n个20位的2进制串的MinDist。

Dist：两个串的异或结果中1的个数

 

/*
随机算法
*/
#include<algorithm>
#include<iostream>
#include<string.h>
#include<stdlib.h>
#include<stdio.h>
#include<math.h>
#include<queue>
#include<stack>
#include<time.h>
#include<map>
#include<set>
using namespace std;
typedef long long int64;
//typedef __int64 int64;
typedef pair<int64,int64> PII;
#define MP(a,b) make_pair((a),(b)) 
const int inf = 0x3f3f3f3f;
const double pi=acos(-1.0);
const int dx[]={1,-1,0,0};
const int dy[]={0,0,1,-1};
const double eps = 1e-8;
const int maxm = 100000+10;
const int maxn = 105;

char str[ maxm ][ 6 ];
int num1[ 22 ],num2[ 22 ];

int GetId( char aim ){
    int ans ;
    if( aim>='0'&&aim<='9' ) ans = aim - '0';
    else if( aim>='A'&&aim<='Z' ) ans = aim - 'A' + 10;
    return ans;
}

int solve( int x,int y ){
    int cnt = 0;
    int cc ;
    for( int i=0;i<5;i++ ){
        int aim = GetId( str[x][i] );
        cc = 4;
        while( cc ){
            num1[ cnt++ ] = aim%2;
            aim /= 2;
            cc -- ;
        }
    }
    //printf("cnt = %d\n",cnt);
    cnt = 0;
    for( int i=0;i<5;i++ ){
        int aim = GetId( str[y][i] );
        cc = 4;
        while( cc ){
            num2[ cnt++ ] = aim%2;
            aim /= 2;
            cc -- ;
        }
    }
    //printf("cnt = %d\n",cnt);
    cnt = 0;
    for( int i=0;i<20;i++ ){
        if( num1[i]!=num2[i] )
            cnt ++ ;
    }
    return cnt ;
}
    
int main(){
    int T;
    scanf("%d",&T);
    while( T-- ){
        int n;
        scanf("%d",&n);
        for( int i=0;i<n;i++ )
            scanf("%s",str[i]);
        srand( time(NULL) );
        int ans = inf;
        int x,y;
        for( int i=0;i<180000;i++ ){
            x = rand()%n;
            y = rand()%n;
            if( x==y ) continue;
            int temp = solve( x,y );
            if( temp<ans )
                ans = temp;
        }
        printf("%d\n",ans);
    }
    return 0;
}