Compilare: user.cpp: In function ‘void solve(int, long long unsigned int)’: user.cpp:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v.size() == k) { ^ user.cpp:44:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((1LL * b * b / b2) % 2 == b % 2) ^ user.cpp:45:75: warning: narrowing conversion of ‘aux’ from ‘long long int’ to ‘long long unsigned int’ inside { } [-Wnarrowing] rasp.push_back({aux, 1LL * b / 2 + (1LL * b * b / b2 / 2)}); ^ user.cpp: In function ‘int main()’: user.cpp:66:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < rasp.size(); ++ i) { ^ user.cpp:57:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("armonica.in", "r", stdin); ^ user.cpp:58:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("armonica.out", "w", stdout); ^ user.cpp:60:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &b); ^