Compilare: main.cpp: In function 'bool pairup(int)': main.cpp:21:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(int i=0;i<G[nod].size();i++) | ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:7: warning: this 'for' clause does not guard... [-Wmisleading-indentation] 47 | { for(int j=1;j<=N;j++) | ^~~ main.cpp:49:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for' 49 | if(pairup(i)) | ^~ main.cpp:35:13: warning: unused variable 'z' [-Wunused-variable] 35 | int x,y,z; | ^