mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
115 lines
2.4 KiB
C++
115 lines
2.4 KiB
C++
#include <cstdio>
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#include <algorithm>
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#include <string>
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#include <cstring>
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#include <stack>
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#include <cmath>
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#include <queue>
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#include <list>
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#include <cstdlib>
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#include <vector>
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#include <set>
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#include <map>
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#include <sstream>
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#include <iostream>
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#include <stack>
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using namespace std;
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int n,m,q;
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struct Node
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{
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int e,xia,val;
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}e1[20001];
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struct Node2
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{
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int e,xia;
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}e2[2000001];
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int d1,d2,head1[10001],head2[10001];
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bool vis[10001];
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int fat[10001],dis[10001],ans[1000001];
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void add1(int s,int e,int val)
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{
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e1[d1].e=e,e1[d1].val=val,e1[d1].xia=head1[s];
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head1[s]=d1++;
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}
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void add2(int s,int e)
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{
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e2[d2].e=e,e2[d2].xia=head2[s];
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head2[s]=d2++;
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}
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int find(int num)
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{
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if(fat[num] == num)return num;
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return fat[num]=find(fat[num]);
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}
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void Union(int s,int e)
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{
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fat[e]=s;
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}
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void tarjan(int s)
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{
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int i;
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vis[s]=true;
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fat[s]=s;
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for(i=head1[s];i != -1;i=e1[i].xia)
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{
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if(!vis[e1[i].e])
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{
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dis[e1[i].e]=dis[s]+e1[i].val;
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tarjan(e1[i].e);
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Union(s,e1[i].e);
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}
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}
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for(i=head2[s];i != -1 ;i=e2[i].xia)
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{
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if(vis[e2[i].e])
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{
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if(dis[e2[i].e] != -1)
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{
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ans[i/2]=dis[s]+dis[e2[i].e]-2*dis[find(e2[i].e)];
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}
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else ans[i/2]=-1;
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}
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}
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}
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int main()
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{
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int i,j,ji1,ji2,ji3;
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while(~scanf("%d %d %d",&n,&m,&q))
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{
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d1=d2=0;
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memset(head1,-1,sizeof(head1));
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memset(head2,-1,sizeof(head2));
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for(i=0;i<m;i++)
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{
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scanf("%d %d %d",&ji1,&ji2,&ji3);
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add1(ji1,ji2,ji3);
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ji1^=ji2,ji2^=ji1,ji1^=ji2;
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add1(ji1,ji2,ji3);
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}
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for(i=0;i<q;i++)
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{
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scanf("%d %d",&ji1,&ji2);
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add2(ji1,ji2);
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ji1^=ji2,ji2^=ji1,ji1^=ji2;
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add2(ji1,ji2);
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}
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memset(vis,false,sizeof(vis));
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for(i=1;i<=n;i++)fat[i]=i;
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for(i=1;i<=n;i++)
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{
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if(!vis[i])
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{
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memset(dis,-1,sizeof(dis));
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dis[i]=0;
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tarjan(i);
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}
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}
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for(i=0;i<q;i++)
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{
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if(ans[i] == -1)puts("Not connected");
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else printf("%d\n",ans[i]);
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}
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}
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return 0;
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}
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