Battle over Cities

Time Limit : 10000/5000ms (Java/Other)   Memory Limit : 65536/65536K (Java/Other)

Total Submission(s) : 4   Accepted Submission(s) : 0

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Problem Description

It is vitally important to have all the cities connected by highways in a war, but some of them are destroyed now because of the war. Furthermore,if a city is conquered, all the highways from/toward that city will be closed by the enemy, and we must repair some destroyed highways to keep other cities connected, with the minimum cost if possible.
Given the map of cities which have all the destroyed and remaining highways marked, you are supposed to tell the cost to connect other cities if each city is conquered by the enemy.

Input

The input contains multiple test cases. The first line is the total number of cases T (T ≤ 10). Each case starts with a line containing 2 numbers N (0 < N ≤ 20000), and M (0 ≤ M ≤ 100000), which are the total number of cities, and the number of highways, respectively. Then M lines follow, each describes a highway by 4 integers: City1 City2 Cost Status where City1 and City2 are the numbers of the cities the highway connects (the cities are numbered from 1 to N), Cost (0 < Cost ≤ 20000) is the effort taken to repair that highway if necessary, and Status is either 0, meaning that highway is destroyed, or 1, meaning that highway is in use.
Note: It is guaranteed that the whole country was connected before the war and there is no duplicated high ways between any two cities.

Output

For each test case, output N lines of integers. The integer in the i-th line indicates the cost to keep the cities connected if the i-th city is conquered by the enemy. In case the cities cannot be connected after the i-th city is conquered by the enemy, output "inf" instead in the corresponding place.

Sample Input

34 51 2 1 11 3 1 12 3 1 02 4 1 13 4 2 04 51 2 1 11 3 1 12 3 1 02 4 1 13 4 1 03 21 2 1 11 3 1 1

Sample Output

12001100inf00

Author

GUAN, Yao

Source

The 2010 ACM-ICPC Asia Chengdu Regional Contest

 

错误的代码：供自己以后修改

听说这道题要用割点+最小生成树

#include<iostream>
#include<stdio.h>
#include<algorithm>
#define MAXN 20001
using namespace std;
int city,load;
int i,j;
struct edge
{
 int u;
 int v;
 int cost;
 int destory;
}edges[MAXN];
int parent[MAXN];

void UFset()
{
 for(j=1;j<=city;j++)
 {
  parent[j]=-1;
 }
}

int Find(int x)
{
 int s;
 for(s=x;parent[s]>=0;s=parent[s]);
 while(s!=x)
 {
  int tmp=parent[x];
  parent[x]=s;
  x=tmp;
 }
 return s;
}

void Union(int R1,int R2)
{
int r1=Find(R1);
int r2=Find(R2);
int tmp=parent[r1]+parent[r2];
if(parent[r1]>parent[r2])
{
 parent[r1]=r2;
 parent[r2]=tmp;
}
else
{
 parent[r2]=r1;
 parent[r1]=tmp;
}
}

int cmp(const void*a,const void*b)
{
 edge aa=*(const edge*)a;
 edge bb=*(const edge*)b;
 return aa.cost-bb.cost;
}

void Kruskal(int t)
{
 int sumweight=0;
 int num=0;
 int u,v;
 UFset();
 for(j=0;j<load;j++)
 {
  u=edges[j].u;
  v=edges[j].v;
  if(u==t || v==t)
   continue;
  if(Find(u)!=Find(v))
  {
   sumweight+=edges[j].cost;
   num++;
   Union(u,v);
  }
 // if(num>=city-1)
  // break;
 }
 if(num==city-2)
 printf("%d\n",sumweight);
 else
  printf("inf\n");
}

int main()
{
 int n;
 int u,v,cost,destory;
 scanf("%d",&n);
 for(i=1;i<=n;i++)
 {
  scanf("%d%d",&city,&load);
  for(j=0;j<load;j++)
  {
   scanf("%d%d%d%d",&u,&v,&cost,&destory);
   edges[j].u=u;
   edges[j].v=v;
   if(destory==1)
   edges[j].cost=0;
   else
    edges[j].cost=cost;
  }
  qsort(edges,load,sizeof(edges[0]),cmp);
  int t;
  for(t=1;t<=city;t++)
  {
  Kruskal(t);
  }
 }
 return 0;
}