Compilare: user.cpp: In function ‘void match(std::vector<int>&, std::vector<int>&)’: user.cpp:30:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < small->size(); ++i) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:48:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < up[y].size(); ++i) up[x] = min(up[x], up[y]); ^ user.cpp:49:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < down[y].size(); ++i) down[x] = max(down[x], down[y]); } ^ user.cpp:54:38: warning: narrowing conversion of ‘(up[x].std::vector<_Tp, _Alloc>::size<int, std::allocator<int> >() + 4294967295u)’ from ‘std::vector<int>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] rez = max<int>({rez, up[x].size()-1, down[x].size()-1}); } ^ user.cpp:54:38: warning: narrowing conversion of ‘(up[x].std::vector<_Tp, _Alloc>::size<int, std::allocator<int> >() + 4294967295u)’ from ‘std::vector<int>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] user.cpp:54:56: warning: narrowing conversion of ‘(down[x].std::vector<_Tp, _Alloc>::size<int, std::allocator<int> >() + 4294967295u)’ from ‘std::vector<int>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] rez = max<int>({rez, up[x].size()-1, down[x].size()-1}); } ^ user.cpp:54:56: warning: narrowing conversion of ‘(down[x].std::vector<_Tp, _Alloc>::size<int, std::allocator<int> >() + 4294967295u)’ from ‘std::vector<int>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing]