/in/foo.cc: In function 'int main()':
/in/foo.cc:18:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int j=1;j<=m;j++)
  ^~~
/in/foo.cc:20:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
    cin>>a1>>a2>>b1>>b2;
    ^~~