Compilare: main.cpp: In function 'void dfs(int)': main.cpp:24:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | for(i=0;i<a[k].size();i++) | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:66:44: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] 66 | if(niv[e[i][k-1]]<niv[e[i+(1<<k-1)][k-1]]) | ~^~ main.cpp:69:34: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] 69 | e[i][k]=e[i+(1<<k-1)][k-1]; | ~^~ main.cpp:51:11: warning: unused variable 'j' [-Wunused-variable] 51 | int i,j,k; | ^