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\u4ee3\u7801\u5199\u7684\u5de8\u4e11\u3002\u3002\u60b2\u5267\u56e7\u3002
Code\uff1a
#include<cstdio>#include<vector>#include<algorithm>#include<iostream>#define all(x) x.begin(),x.end()using namespace std;typedef pair<int,int> ii;typedef pair<int,ii> Edge;typedef vector<ii> vii;typedef vii::iterator vit;typedef vector<vii> vvii;vector<Edge> E,NotOnTree;vector<int> F;const int maxn=500;int n,m;void setF(){ for(int i=0;i<n;i++)F.push_back(i);}int Find(int x){ if(x==F[x]) return x; return F[x]=Find(F[x]);}void Union(int a,int b){ F[b]=a;}void Init(){ scanf("%d %d",&n,&m);int s,t,c; while(m–) { scanf("%d %d %d",&s,&t,&c);–s;–t; E.push_back(Edge(c,ii(s,t))); }}vii edge[maxn];int Total=0;void Ins_Edge(int s,int t,int c){ edge[s].push_back(ii(t,c)); edge[t].push_back(ii(s,c));}void dealEdge(const Edge&e){ ii t=e.second; int i=Find(t.first),j=Find(t.second); if(i!=j) { Union(i,j); Ins_Edge(t.first,t.second,e.first); Total+=e.first; } else { NotOnTree.push_back(e); }}void CalMST(){ sort(all(E)); setF(); for_each(all(E),dealEdge);}int Max_Edge[maxn][maxn];int s;void dfs(int x,int f,int Max){ Max_Edge[s][x]=Max; for(vit e=edge[x].begin();e!=edge[x].end();++e) if(e->first!=f) dfs(e->first,x,max(Max,e->second));}int Ans;void dealEdge2(const Edge&e){ int Now=Total-Max_Edge[e.second.first][e.second.second]+e.first; \/\/cout<<e.second.first<<" "<<e.second.second<<" "<<e.first<<endl; \/\/cout<<Now<<endl; if(Ans==-1||Now<Ans) Ans=Now;}void Work(){ CalMST();Ans=-1; for(int i=0;i<n;i++)s=i,dfs(i,-1,0); for_each(all(NotOnTree),dealEdge2); cout<<"Cost:"<<Total<<endl; cout<<"Cost:"<<Ans<<endl;}int main(){ \/\/freopen("in","r",stdin); Init(); Work();} <\/p>\n","protected":false},"excerpt":{"rendered":"
\u8fd9\u4e2a\u662f\u6b21\u5c0f\u751f\u6210\u6811\uff0c\u6211\u7528\u7684\u662fn^2\u7684\u7b97\u6cd5\uff0c\u5148\u7b97\u51fa\u6700\u5c0f\u751f\u6210\u6811\uff0c\u7136\u540e\u7b97\u51fa\u6bcf\u4e00\u6761\u8def\u5f84\u4e2d\u6700\u5927\u7684\u8fb9\uff0c\u7136\u540e\u679a\u4e3e\u6bcf\u4e00\u6761\u4e0d\u518d\u6811\u4e0a\u7684\u8fb9\u3002\u3002\u4ee3\u7801\u5199\u7684\u5de8\u4e11\u3002\u3002\u60b2\u5267\u56e7\u3002Code\uff1a#include<cstdio>#include<vector>#include<algorithm>#include<iostream>#define all(x) x.begin(),x.end()using namespace std;typedef pair<int,int> ii;typedef pair<int,ii> Edge;typedef vector<ii> vii;typedef vii::iterator vit;typedef vector<vii> vvii;vector<Edge> E,NotOnTree;vector<int> F;const int maxn=500;int n,m;void setF(){ for(int i=0;i<n;i++)F.push_back(i);}int Find(int x){ if(x==F[x]) return x; return F[x]=Find(F[x]);}void Union(int a,int b){ F[b]=a;}void Init(){ scanf("%d %d",&n,&m);int s,t,c; while(m–) { scanf("%d %d %d",&s,&t,&c);–s;–t; E.push_back(Edge(c,ii(s,t))); }}vii edge[maxn];int Total=0;void Ins_Edge(int s,int t,int c){ edge[s].push_back(ii(t,c)); edge[t].push_back(ii(s,c));}void dealEdge(const Edge&e){ […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[10],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts\/155"}],"collection":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=155"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts\/155\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=155"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=155"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=155"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}