hdu1198 普通的并查集

今天开始（第三轮）并查集，，之前学的忘了一些

本题很简单直接上代码

#include<iostream>
#include<cstring>
#include<cstdio>
#define MAXN 55 
using namespace std;
int F[MAXN*MAXN];
int find(int x){
    if(F[x]==-1) return x;
    return F[x]=find(F[x]);
}
void bing(int a,int b){
    int t1=find(a);
    int t2=find(b);
    if(t1!=t2) F[t1]=t2;
}
char mp[MAXN][MAXN];
int main(){
    int n,m;
    while(scanf("%d%d",&n,&m)==2 && n>0){
        for(int i=0;i<n;i++)
            for(int j=0;j<m;j++)
                cin>>mp[i][j]; 
        for(int i=0;i<n*m;i++)
            F[i]=-1;
        for(int i=0;i<n;i++)
            for(int j=0;j<m;j++){//上下联通或者左右联通 
                if(i>0 && (mp[i][j]=='A'||mp[i][j]=='B'||mp[i][j]=='E'||mp[i][j]=='G'||mp[i][j]=='H'||mp[i][j]=='J'||mp[i][j]=='K'))
                    if(mp[i-1][j]=='C'||mp[i-1][j]=='D'||mp[i-1][j]=='E'||mp[i-1][j]=='H'||mp[i-1][j]=='I'||mp[i-1][j]=='J'||mp[i-1][j]=='K')
                        bing(i*m+j,(i-1)*m+j);
                if(j>0 && (mp[i][j]=='A'||mp[i][j]=='C'||mp[i][j]=='F'||mp[i][j]=='G'||mp[i][j]=='H'||mp[i][j]=='I'||mp[i][j]=='K'))
                    if(mp[i][j-1]=='B'||mp[i][j-1]=='D'||mp[i][j-1]=='F'||mp[i][j-1]=='G'||mp[i][j-1]=='I'||mp[i][j-1]=='J'||mp[i][j-1]=='K')
                        bing(i*m+j,i*m+j-1);
            }
        int ans=0;
        for(int i=0;i<n*m;i++)
            if(F[i]==-1)
                ans++;
        printf("%d
",ans);
    }
    return 0;
}