/in/foo.cc: In function 'int main()':
/in/foo.cc:17:4: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
    if (i!=n||j!=n)
    ^~
/in/foo.cc:32:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
     maxx=max(maxx, a[i][j]);
     ^~~~
/in/foo.cc:17:7: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
    if (i!=n||j!=n)
       ^
/in/foo.cc:32:25: error: 'j' was not declared in this scope
     maxx=max(maxx, a[i][j]);
                         ^