Compilare: user.cpp: In function ‘int main()’: user.cpp:82:9: warning: unused variable ‘p’ [-Wunused-variable] int i, p, j, n; ^ user.cpp:84:25: 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:86:10: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp:97:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &cost[i]); ^ /tmp/cclemVN3.o: In function `main': user.cpp:(.text.startup+0x50): warning: the `gets' function is dangerous and should not be used.