Compilare: user.cpp: In function ‘int main()’: user.cpp:55:131: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(maximum(maximum(hamming[0],hamming[1]),hamming[2])-minimum(minimum(hamming[0],hamming[1]),hamming[2])>=v[3].size()+1){ ^ user.cpp:64:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[3].size();i++){ ^ user.cpp:19:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cstring.in","r",stdin); ^ user.cpp:20:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cstring.out","w",stdout); ^ user.cpp:22:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n%s%s%s",&n,s[0],s[1],s[2]); ^