Compilare: user.cpp: In function ‘bool PassPreliminaryTest(std::vector<float>, unsigned int)’: user.cpp:21:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < energy.size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:41:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G; i++) ^ user.cpp:52:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (countE < W && Eg.size() > 0 && Cg.size() > 0){ ^ user.cpp:56:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < Eg.size(); i++){ ^ user.cpp:78:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (countE >= W) ^ user.cpp:31:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("energii.in", "r", stdin); ^ user.cpp:32:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("energii.out", "w", stdout); ^ user.cpp:34:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &G); ^ user.cpp:39:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &W); ^ user.cpp:42:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%f %f", &Eg[i], &Cg[i]); ^