Main.cc: In function ‘long long int check(int, int)’: Main.cc:10:12: error: ‘o’ was not declared in this scope memset(ta,o,sizeof(ta)); ^ Main.cc: In function ‘int main()’: Main.cc:22:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&k); ~~~~~^~~~~~~~~~~~~~~~~~~ Main.cc:24:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i]); ~~~~~^~~~~~~~~~~~ Main.cc:28:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&b[i]); ~~~~~^~~~~~~~~~~~