Compilare: user.cpp:32:25: warning: ‘cmp’ function uses ‘auto’ type specifier without trailing return type [enabled by default] auto cmp(point a,point b){ ^ user.cpp:42:13: warning: ‘update’ function uses ‘auto’ type specifier without trailing return type [enabled by default] auto update(){ ^ user.cpp: In function ‘int main()’: user.cpp:86:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < nodes.size() && nodes[i].x_coord == nodes[0].x_coord) ^ user.cpp:89:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i+1 == nodes.size()){ ^