Compilare: user.cpp: In function ‘void Solve_2()’: user.cpp:70:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(S); ^ user.cpp: In function ‘int main()’: user.cpp:141:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &P, &N); ^ /tmp/ccsefvCP.o: In function `Solve_2()': user.cpp:(.text+0x275): warning: the `gets' function is dangerous and should not be used.