Compilare: user.cpp: In function ‘void updateStk(std::vector<int>*, int, int)’: user.cpp:18:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (where >= stk -> size()) ^ user.cpp: In function ‘std::vector<int>* uniteLis(std::vector<int>*, std::vector<int>*)’: user.cpp:72:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lisStk1 -> size(); ++ i) ^ user.cpp:79:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lisStk2 -> size(); ++ i) ^ user.cpp: In function ‘std::vector<int>* uniteLds(std::vector<int>*, std::vector<int>*)’: user.cpp:89:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ldsStk1 -> size(); ++ i) ^ user.cpp:96:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ldsStk2 -> size(); ++ i) ^ user.cpp: In function ‘void dfs(int, int)’: user.cpp:129:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < graph[node].size(); ++ i) { ^ user.cpp:137:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lis1 -> size(); ++ i) { ^ user.cpp:143:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lds2 -> size(); ++ i) { ^ user.cpp:150:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lis2 -> size(); ++ i) { ^ user.cpp:156:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lds1 -> size(); ++ i) { ^