Compilare: main.cpp: In function 'int main()': main.cpp:161:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < DOWN[edgeToDelete.y].size();++i) { ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:175:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < DOWN[edgeToDelete.y].size();++i) { ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:128:21: warning: variable 'maxxIndex' set but not used [-Wunused-but-set-variable] int maxx{}, maxxIndex{}; ^~~~~~~~~ main.cpp:20:53: warning: 'edgeToDelete.Edge::cost' may be used uninitialized in this function [-Wmaybe-uninitialized] stream << e.x << ' ' << e.y << ' ' << e.cost; ^ main.cpp:130:14: note: 'edgeToDelete.Edge::cost' was declared here Edge edgeToDelete; ^~~~~~~~~~~~ main.cpp:130:14: warning: 'edgeToDelete.Edge::y' may be used uninitialized in this function [-Wmaybe-uninitialized] main.cpp:162:21: warning: 'edgeToDelete.Edge::x' may be used uninitialized in this function [-Wmaybe-uninitialized] if(DOWN[edgeToDelete.y][i] == edgeToDelete.x) { ^~