Compilare: user.cpp: In function ‘int main()’: user.cpp:33:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < A.size() && j < B.size()) { ^ user.cpp:33:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < A.size() && j < B.size()) { ^ user.cpp:10:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mobs.in", "rt", stdin); ^ user.cpp:11:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mobs.out", "wt", stdout); ^ user.cpp:17:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &a, &b); ^ user.cpp:24:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &h); ^