Compilare: user.cpp: In function ‘void build(int, int, int)’: user.cpp:60:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(lef<H[ls].size()&&rig<H[rs].size()) ^ user.cpp:60:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(lef<H[ls].size()&&rig<H[rs].size()) ^ user.cpp:75:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(lef<H[ls].size()) ^ user.cpp:81:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(rig<H[rs].size()) ^ user.cpp: In function ‘int main()’: user.cpp:167:22: warning: unused variable ‘sol’ [-Wunused-variable] int solu,sol; ^ user.cpp:133:33: 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:134:35: 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); ^