求助

#include<bits/stdc++.h>
using namespace std;
long long l,n,a[303][303],s[2003],f[2003][203][203],minn,t;
int main(){
    t=1;
//    cout<<t<<endl;
    while(t--){
        memset(f,0x3f,sizeof(f));
        minn=2100000000;
        cin>>l>>n;
        s[0]=3;
        f[0][1][2]=0;
        for(int i=1;i<=l;i++){
            for(int j=1;j<=l;j++){
                cin>>a[i][j];
            }
        }
        f[0][1][2]=0;
        for(int i=1;i<=l;i++){
            cin>>s[i];
        }
        s[0]=3;
        for(int k=0;k<=n;k++){
            for(int i=1;i<=l;i++){
                for(int j=1;j<=l;j++){
                	if(s[k]==i)continue;
                	if(s[k]==j)continue;
                	if(i==j)continue;
                    f[k+1][i][j]=min(f[k+1][i][j],f[k][i][j]+a[s[i]][s[i+1]]);
                    f[k+1][s[k]][j]=min(f[k+1][s[k]][j],f[k][i][j]+a[i][s[i+1]]);
                    f[k+1][i][s[k]]=min(f[k+1][i][s[k]],f[k][i][j]+a[j][s[i+1]]);
                }
            }
        }
//        cout<<1<<endl;
        for(int i=1;i<=l;i++){
            for(int j=1;j<=l;j++){
                minn=min(minn,f[n][i][j]);
            }
        }
        cout<<minn<<endl;
    }
    return 0;
}