foo.cpp:1:21: warning: extra tokens at end of #include directive
 #include <iostream> #include <cstdio>
                     ^
foo.cpp: In function 'int main()':
foo.cpp:34:26: error: 'scanf' was not declared in this scope
 scanf( "%d %d" , &n , &m );
                          ^
foo.cpp:60:26: error: 'printf' was not declared in this scope
 printf( "%d\n" , a[x][y] );
                          ^
foo.cpp:62:16: error: 'printf' was not declared in this scope
 printf( "-1\n" );
                ^