Compilare: user.cpp: In function ‘long long int divide(int, int)’: user.cpp:46:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < p.size (); ++i) ^ user.cpp:47:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j <= i + 5 && j < p.size (); ++j) ^ user.cpp: In function ‘int main()’: user.cpp:55:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cmap.in", "r", stdin); ^ user.cpp:56:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cmap.out", "w", stdout); ^ user.cpp:59:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &n); ^ user.cpp:62:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &v[i].f, &v[i].s); ^