Compilare: user.cpp: In function ‘void solve(int)’: user.cpp:19:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(pos<strlen(buff)) ^ user.cpp: In function ‘int main()’: user.cpp:80:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("dir.in","r",stdin); ^ user.cpp:81:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("dir.out","w",stdout); ^ user.cpp:82:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",buff); ^