Compilare: user.cpp: In function ‘int main()’: user.cpp:121:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < Sol.size(); i++) { ^ user.cpp:79:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("harta.in", "r", stdin); ^ user.cpp:80:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("harta.out", "w", stdout); ^ user.cpp:82:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:85:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &Out[i], &In[i]); ^