/in/foo.cc: In function 'int main()':
/in/foo.cc:19:22: error: 'memset' was not declared in this scope
  memset(a,0,sizeof(a));
                      ^
/in/foo.cc:36:14: warning: suggest parentheses around comparison in operand of '==' [-Wparentheses]
   if(b[v][j] == b[j][v] == 1 && v > j)
      ~~~~~~~~^~~~~~~~~~
/in/foo.cc:43:46: warning: suggest parentheses around comparison in operand of '==' [-Wparentheses]
     if(c[i][j]<(c[i][k]+c[k][j]) && (b[i][k] == b[k][j] == 1) && i!= j)
                                      ~~~~~~~~^~~~~~~~~~