Compilare: user.cpp: In function ‘int main()’: user.cpp:21:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=k;i<strlen(a);i++) ^ user.cpp:16:22: warning: variable ‘len’ set but not used [-Wunused-but-set-variable] int nr=0,sol=0,i,len,num=1; ^ user.cpp:11:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("blis.in","r",stdin); ^ user.cpp:12:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("blis.out","w",stdout); ^ user.cpp:13:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&k); ^ user.cpp:14:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",a); ^