acwing 274

#include 


using namespace std;

const int N = 210, M = 1010;

int l, n;
int c[N][N];
int a[M];
int f[M][N][N];


signed main()
{
    scanf("%d%d", &l, &n);
    for (int i = 1; i <= l; i ++)
        for (int j = 1; j <= l; j ++) scanf("%d", &c[i][j]);
    for (int i = 1; i <= n; i ++) scanf("%d", &a[i]);
    
    memset(f, 0x3f, sizeof f);
    
    a[0] = 3;
    f[0][1][2] = 0;
    
    for (int i = 0; i <= n - 1; i ++)
        for (int x = 1; x <= l; x ++)
            for (int y = 1; y <= l; y ++) 
            {
                int z = a[i], pos = a[i + 1];
                if (x == y || y == z || x == z) continue;
                //if (f[i][x][y] >= 0x3f) continue;
                
                f[i + 1][x][y] = min(f[i + 1][x][y], f[i][x][y] + c[z][pos]);
                f[i + 1][z][y] = min(f[i + 1][z][y], f[i][x][y] + c[x][pos]);
                f[i + 1][x][z] = min(f[i + 1][x][z], f[i][x][y] + c[y][pos]);
            }
    
    int mx = INT_MAX;
    for (int i = 1; i <= l; i ++) 
        for (int j = 1; j <= l; j ++) {
            mx = min(mx, f[n][i][j]);
        }
    
    printf("%d", mx);
    return 0;
}