View Compilation Error

0_0_30446418_10953.cpp: In function 'int floyed()':
0_0_30446418_10953.cpp:17:72: error: 'vis' was not declared in this scope
                else if(w[i][j] == w[i][k]+w[k][j]&&(i!=j&&i!=k&&j!=k)) vis[i][j] = 1, ans--;
                                                                        ^
0_0_30446418_10953.cpp: In function 'int main()':
0_0_30446418_10953.cpp:30:16: error: 'vis' was not declared in this scope
         memset(vis,0,sizeof(vis));
                ^