Compilare: user.cpp: In function ‘int main()’: user.cpp:8:15: warning: unused variable ‘j’ [-Wunused-variable] int n,k,i,j,kk,s=0,kkk; ^ user.cpp:8:17: warning: unused variable ‘kk’ [-Wunused-variable] int n,k,i,j,kk,s=0,kkk; ^ user.cpp:8:20: warning: unused variable ‘s’ [-Wunused-variable] int n,k,i,j,kk,s=0,kkk; ^ user.cpp:8:24: warning: unused variable ‘kkk’ [-Wunused-variable] int n,k,i,j,kk,s=0,kkk; ^ user.cpp:6:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] { freopen("minusk.in", "r",stdin); ^ user.cpp:7:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("minusk.out", "w",stdout); ^ user.cpp:9:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^