Compilare: main.cpp: In function 'void euler(int)': main.cpp:15:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(int i = 0; i < adj[ngb].size(); ++i) | ~~^~~~~~~~~~~~~~~~~ main.cpp:15:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation] 15 | for(int i = 0; i < adj[ngb].size(); ++i) | ^~~ main.cpp:18:13: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for' 18 | if(idx + 1){ | ^~