Compilare: user.cpp: In function ‘void get_dp()’: user.cpp:45:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int p = 0; p < pos[a[i] - 'a'].size() && pos[a[i] - 'a'][p] <= i; ++ p) ^ user.cpp: In function ‘void read()’: user.cpp:26:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^ user.cpp:27:31: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(a + 1, n + 2, stdin); ^