Compilare: user.cpp: In function ‘long long int val(unsigned int, int, int)’: user.cpp:9:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (l <= lat) { ^ user.cpp:10:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (c <= lat) ^ user.cpp:16:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (c <= lat) ^ user.cpp: In function ‘int main()’: user.cpp:26:15: warning: unused variable ‘r’ [-Wunused-variable] long long r; ^ user.cpp:28:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&k); ^ user.cpp:31:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&l,&c); ^