Compilare: user.cpp: In function ‘void build(int, int, int)’: user.cpp:77:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(lef<H[ls].size()&&rig<H[rs].size()) ^ user.cpp:77:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(lef<H[ls].size()&&rig<H[rs].size()) ^ user.cpp:92:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(lef<H[ls].size()) ^ user.cpp:98:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(rig<H[rs].size()) ^ user.cpp: In function ‘int main()’: user.cpp:153:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mess.in","r",stdin); ^ user.cpp:154:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mess.out","w",stdout); ^ user.cpp:227:16: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<sol<<"\n"; ^