Compilare: user.cpp: In function ‘bool PassPreliminaryTest(std::vector<unsigned int>, 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 ‘void Solve(std::vector<int>, std::vector<int>, std::vector<int>)’: user.cpp:32:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G; i++) { ^ user.cpp:39:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j >= W) ^ user.cpp:40:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((flag == -1) || (Tcost[flag] > Tcost[j])) ^ user.cpp:45:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (flag != -1) ^ user.cpp: In function ‘int main()’: user.cpp:61:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G; i++) ^ user.cpp:52:35: 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:53:37: 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:55:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &G, &W); ^ user.cpp:62:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &Eg[i], &Cg[i]); ^