Compilare: user.cpp: In function ‘int main()’: user.cpp:23:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (solb == -1 || sola + solb > key + cntrlKey) { ^ user.cpp:32:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (solb == -1) { ^ user.cpp:9:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("taste.in", "r", stdin); ^ user.cpp:10:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("taste.out", "w", stdout); ^ user.cpp:12:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &x, &y); ^