Compilare: user.cpp: In function ‘bool get_ans()’: user.cpp:58:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < H[cod].size(); ++ j) ^ user.cpp: In function ‘int main()’: user.cpp:67:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d\n", &n, &m, &l, &k); ^ user.cpp:68:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", a + 1); ^ user.cpp:75:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", Word + 1); ^