Compilare: user.cpp: In member function ‘void SuffixArray::radix()’: user.cpp:43:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<aux.size();i++) wh[ aux[i].y ].pb(aux[i]); ^ user.cpp:49:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<aux.size();i++) wh[ aux[i].x ].pb(aux[i]); ^ user.cpp: In member function ‘void SuffixArray::init(int, char*)’: user.cpp:71:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<aux.size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:101:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ghicit.in","r",stdin); ^ user.cpp:102:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ghicit.out","w",stdout); ^ user.cpp:104:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s+1); ^ /tmp/ccO79HQy.o: In function `main': user.cpp:(.text.startup+0x56): warning: the `gets' function is dangerous and should not be used.