Compilare: user.cpp: In function ‘int main()’: user.cpp:13:18: warning: unused variable ‘s’ [-Wunused-variable] int n, i, j, s, t, d, k, kk; ^ user.cpp:13:21: warning: variable ‘t’ set but not used [-Wunused-but-set-variable] int n, i, j, s, t, d, k, kk; ^ user.cpp:13:30: warning: unused variable ‘kk’ [-Wunused-variable] int n, i, j, s, t, d, k, kk; ^ user.cpp:9:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("exp.in","r",stdin); ^ user.cpp:10:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("exp.out","w",stdout); ^ user.cpp:15:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&k,&n); ^ user.cpp:17:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&d); ^