Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:15:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for( i = 0; i < v[x].size(); i++ ){ | ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<elem>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for( i = 0; i < euler.size(); i++ ){ | ~~^~~~~~~~~~~~~~ main.cpp:50:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<elem>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for( i = 1; ( 1 << i ) <= euler.size(); i++ ){ | ~~~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:51:48: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<elem>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for( j = 0; j + ( 1 << i ) - 1 < euler.size(); j++ ){ | ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~ main.cpp:64:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<elem>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | for( i = 2; i < euler.size(); i++ ){ | ~~^~~~~~~~~~~~~~