Compilare: main.cpp: In function 'int main()': main.cpp:35:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < v[1].size() ; i++ ) M.insert ( { v[1][i].cost, v[1][i].dest } ); ~~^~~~~~~~~~~~~ main.cpp:45:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < v[y].size() ; i++ ) M.insert ( { x + v[y][i].cost, v[y][i].dest } ); ~~^~~~~~~~~~~~~