Compilare: user.cpp: In function ‘int calc(int, int)’: user.cpp:23:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, k=1; ^ user.cpp: In function ‘int main()’: user.cpp:48:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<h.size(); ++i){ ^ user.cpp:34:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sumadiv.in", "r", stdin); ^ user.cpp:35:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sumadiv.out", "w", stdout); ^ user.cpp:36:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &j, &k); ^