题目链接:
题意:
是否存在一条连接特殊和不特殊的边,存在最小值是多少;
思路:
扫一遍所有边;
AC代码:
#include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #include <cmath> #include <bits/stdc++.h> #include <stack> #include <map> using namespace std; #define For(i,j,n) for(int i=j;i<=n;i++) #define mst(ss,b) memset(ss,b,sizeof(ss)); typedef long long LL; template<class T> void read(T&num) { char CH; bool F=false; for(CH=getchar();CH<‘0‘||CH>‘9‘;F= CH==‘-‘,CH=getchar()); for(num=0;CH>=‘0‘&&CH<=‘9‘;num=num*10+CH-‘0‘,CH=getchar()); F && (num=-num); } int stk[70], tp; template<class T> inline void print(T p) { if(!p) { puts("0"); return; } while(p) stk[++ tp] = p%10, p/=10; while(tp) putchar(stk[tp--] + ‘0‘); putchar(‘\n‘); } const LL mod=1e9+7; const double PI=acos(-1.0); const int inf=1e9+10; const int N=1e5+10; const int maxn=1e3+20; const double eps=1e-12; int n,m,k,x; int vis[N],u[N],v[N],w[N]; int main() { read(n);read(m);read(k); For(i,1,m) { read(u[i]);read(v[i]);read(w[i]); } For(i,1,k) { read(x); vis[x]=1; } int ans=inf; For(i,1,m) { if(!vis[u[i]]&&vis[v[i]])ans=min(ans,w[i]); if(!vis[v[i]]&&vis[u[i]])ans=min(ans,w[i]); } if(ans==inf)cout<<"-1"<<endl; else cout<<ans<<endl; return 0; }
时间: 2024-10-05 16:13:50