Compilare: main.cpp: In function 'int main()': main.cpp:45:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for (j=0;j<nodes[frontnode.val].size();j++) | ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:65:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | for (j=0;j<nodes[frontnode.val].size();j++) | ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:58:11: warning: 'last' may be used uninitialized [-Wmaybe-uninitialized] 58 | q.push({last,0}); | ~~~~~~^~~~~~~~~~ main.cpp:29:19: note: 'last' was declared here 29 | int n,i,j,u,v,last,mx; | ^~~~