Compilare: user.cpp: In function ‘bool valid(long long unsigned int, long long unsigned int, long long unsigned int)’: user.cpp:12:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<=n; i++){ ^ user.cpp:13:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[i]<=mij) ^ user.cpp: In function ‘int main()’: user.cpp:31:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<=n; i++){ ^ user.cpp:29:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%llu%llu", &k, &n); ^ user.cpp:32:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i]); ^