/in/foo.cc: In function 'int main()':
/in/foo.cc:51:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d %d\n",&rr,&cc);
                            ^
/in/foo.cc:56:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
      scanf("%c",&ch);
                     ^
/in/foo.cc:59:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("\n");
                ^