Compilare: main.cpp: In function 'void euler(int)': main.cpp:22:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | while(head[u] < G[u].size()) { | ~~~~~~~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:78:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | if(head[i] < G[i].size()) { | ~~~~~~~~^~~~~~~~~~~~~ main.cpp:92:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 92 | for(int i = 0; i < ans.size(); i++) { | ~~^~~~~~~~~~~~ main.cpp:94:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 94 | for(int j = 0; j < ans[i].size(); j++) { | ~~^~~~~~~~~~~~~~~ main.cpp:95:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 95 | fout << ans[i][j] << (j == ans[i].size() - 1 ? "" : " "); | ~~^~~~~~~~~~~~~~~~~~~~