csu 1326 The contest

裸的   并查集  +  分组背包；

 #include<iostream>
 #include<cstring>
 #include<algorithm>
 #include<stdio.h>
 #include<cmath>
 #include<vector>
 using namespace std;

 vector<int>vv[];
 vector<int>ss[];
 int f[],N,M,W,wi[],pi[],dp[];
 int find( int x ){
     if( x != f[x] )return f[x] = find(f[x]);
     return x;
 }
 void inint( ){
     memset( dp,,sizeof(dp) );
     for( int i = ; i <= N; i++ ) f[i] = i;
     for( int i = ; i <= N; i++ )vv[i].clear();
     for( int i = ; i <= N; i++ )ss[i].clear();
     for( int j = ; j <= N; j++ )
         scanf("%d%d",&pi[j],&wi[j]);
 }
 int main( )
 {
      while( scanf("%d%d%d",&N,&W,&M) != EOF )
      {
          inint( );
          for( int i = ; i <= M; i++ )
          {
              int u,v; scanf("%d%d",&u,&v);
              u = find( u );  v = find( v );
              if( u != v )f[u] = v;
          }
         for( int i = ; i <= N; i++ )
             vv[find(i)].push_back(i);
         int k = ;
         for( int i = ; i <= N; i++ )
         {
             int len = vv[i].size();
             if( len ==  )continue; k++;
             for( int j = ; j < len; j++ )
             ss[k].push_back(vv[i][j]);
         }
         for( int i = ; i <= k; i++ )                       // 这里是分组背包；
         for( int j = W; j >= ; j-- )
         for( int t = ; t < ss[i].size( ); t++ )
         if( j >= wi[ss[i][t]] )
             dp[j] = max( dp[j],dp[j - wi[ss[i][t]]] + pi[ss[i][t]] );
         cout<<dp[W]<<endl;
      }
      return ;
 }