Compilare: user.cpp: In function ‘bool Check(int, int)’: user.cpp:25:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < d.size(); ++i){ ^ user.cpp: In function ‘void Update(int, int)’: user.cpp:53:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < d.size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:108:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("randomizare.in", "r", stdin); ^ user.cpp:109:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("randomizare.out", "w", stdout); ^ user.cpp:111:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:114:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^ user.cpp:117:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &p[i]); ^ user.cpp: In function ‘void SolveCycle(int)’: user.cpp:99:25: warning: ‘answer’ may be used uninitialized in this function [-Wmaybe-uninitialized] Update(length, answer); ^ user.cpp:102:21: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized] start = p[start]; ^