Compilare: user.cpp: In function ‘void addValue(std::vector<int>&, std::vector<std::pair<int, int> >&, int, int)’: user.cpp:9:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < divisors.size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:55:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < divisors.size(); j++) { ^ user.cpp:19:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("chernel.in", "r", stdin); ^ user.cpp:20:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("chernel.out", "w", stdout); ^ user.cpp:24:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); N--; ^