Compilare: user.cpp: In function ‘int main()’: user.cpp:4:19: warning: unused variable ‘j’ [-Wunused-variable] int t,n,k,l,nr,i,j,b; ^ user.cpp:8:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("parola.in", "r", stdin); ^ user.cpp:9:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("parola.out", "w", stdout); ^ user.cpp:11:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:13:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&k); ^ user.cpp:14:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("\n%c",&c); ^ user.cpp:6:11: warning: ‘k’ is used uninitialized in this function [-Wuninitialized] for(i=0;i<=k;i++) cnt[i]=0; ^