想清楚后能發現就要讓我們求最小生成樹（如果圖連通的話，否則就是森林）

//#pragma comment(linker, "/STACK:1024000000,1024000000") #include<cstdio> #include<cstring> #include<cstdlib> #include<algorithm> #include<iostream> #include<sstream> #include<cmath> #include<climits> #include<string> #include<map> #include<queue> #include<vector> #include<stack> #include<set> using namespace std; typedef long long ll; typedef unsigned long long ull; typedef pair<int,int> pii; #define pb(a) push(a) #define INF 0x1f1f1f1f #define lson idx<<1,l,mid #define rson idx<<1|1,mid+1,r #define PI 3.1415926535898 template<class T> T min(const T& a,const T& b,const T& c) {return min(min(a,b),min(a,c)); } template<class T> T max(const T& a,const T& b,const T& c) {return max(max(a,b),max(a,c)); } void debug() { #ifdef ONLINE_JUDGE #elsefreopen("in.txt","r",stdin);//freopen("d:\\out1.txt","w",stdout); #endif } int getch() {int ch;while((ch=getchar())!=EOF) {if(ch!=' '&&ch!='\n')return ch;}return EOF; }struct Edge {int u,v,w;bool operator < (const Edge &ant) const{return w<ant.w;} };vector<Edge> edge; int n,m,k;int a[20002]; void InitUnionFind() {for(int i=0;i<n+m;i++)a[i]=i; } int find(int x) {return x==a[x]?x:a[x]=find(a[x]); } void marge(int fa,int fb) {a[fa]=fb; } int MST() {InitUnionFind();sort(edge.begin(),edge.end());int res=0;int cnt=0;for(int i=0;i<edge.size();i++){int a=edge[i].u;int b=edge[i].v;int fa=find(a),fb=find(b);if(fa!=fb){res+=edge[i].w;if(++cnt==n+m-1)break;marge(fa,fb);}}return res; } int main() {int t;scanf("%d",&t);for(int ca=1;ca<=t;ca++){edge.clear();scanf("%d%d%d",&n,&m,&k);for(int i=1;i<=k;i++){int u,v,w;scanf("%d%d%d",&u,&v,&w);edge.push_back((Edge){u,v+n,-w});}printf("%d\n",(n+m)*10000+MST());}return 0; } View Code

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轉載于:https://www.cnblogs.com/BMan/p/3647583.html

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