Compilare: user.cpp: In function ‘int main()’: user.cpp:34:15: warning: unused variable ‘j’ [-Wunused-variable] int n, i, j, s, t, d,k; ^ user.cpp:34:21: warning: unused variable ‘t’ [-Wunused-variable] int n, i, j, s, t, d,k; ^ user.cpp:34:24: warning: unused variable ‘d’ [-Wunused-variable] int n, i, j, s, t, d,k; ^ user.cpp:31:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("z.in","r",stdin); ^ user.cpp:32:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("z.out","w",stdout); ^ user.cpp:36:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:38:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&l,&c); ^