Compilare: user.cpp: In function ‘long long int END(int, int)’: user.cpp:81:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < w[A][B].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:22:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &N, &L); ^ user.cpp:26:20: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(S); NR = strlen(S); p = 0; ^ /tmp/ccZPhZUI.o: In function `main': user.cpp:(.text.startup+0x48): warning: the `gets' function is dangerous and should not be used.