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注意dis[i][j]!=dis[j][i],贡献了8次WA,刚开始做状压,错了都不知觉#include<iostream> #include<cstdio> #include<cctype> #include<cstdlib> #include<cmath> #include<algorithm> #include<cstring> #include<string> #include<vector> #include<queue> #include<map> #include<set> #include<sstream> #include<stack> using namespace std; #define MAX 105 typedef long long LL; const double pi=3.141592653589793; const int INF=1e9; const double inf=1e20; const double eps=1e-6; int d[15][2500]; int main(){ int n; int dis[15][15]; while(cin>>n&&n){ for(int i=0;i<=n;i++) for(int j=0;j<=n;j++) cin>>dis[i][j]; for(int k=0;k<=n;k++){ for(int i=0;i<=n;i++){ for(int j=0;j<=n;j++){ if(i!=k&&k!=j&&i!=j) dis[i][j]=min(dis[i][j],dis[i][k]+dis[k][j]);//Floyd求出每个点之间的最短路,因为这题可以重复经过某个点 //然后就可以看成不能重复经过的TSP问题了 } } } for(int s=0;s<(1<<n);s++){//s枚举已经经过的城市的情况 for(int i=1;i<=n;i++){ if(s&(1<<(i-1))){ if(s==(1<<(i-1))) d[i][s]=dis[0][i];//经过情况中只有i城市,所以是从0出发的。 else { d[i][s]=INF; for(int j=1;j<=n;j++){ if(j!=i&&s&(1<<(j-1))){//枚举已经经过j,并且j不是i d[i][s]=min(d[i][s],dis[j][i]+d[j][s^(1<<(i-1))]);//从j-i的情况,当时经过城市里没有i } } } } } } int ans=INF; for(int i=1;i<=n;i++){ ans=min(ans,d[i][(1<<n)-1]+dis[i][0]); } printf("%d\n",ans); } return 0; } Followed by: Post your reply here: |
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