Compilare: user.cpp: In function ‘int main()’: user.cpp:31:18: warning: unused variable ‘k’ [-Wunused-variable] int N, K, i, j, k,p,nrv; ^ user.cpp:31:20: warning: unused variable ‘p’ [-Wunused-variable] int N, K, i, j, k,p,nrv; ^ user.cpp:33:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &N, &K); ^ user.cpp:34:13: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s + 1); ^ /tmp/ccbjYX0h.o: In function `main': user.cpp:(.text.startup+0x3a): warning: the `gets' function is dangerous and should not be used.