Compile Error
/in/main.cpp: In constructor 'GraphAdjList::GraphAdjList(int, int, std::vector<std::vector<int> >)':
/in/main.cpp:42:17: error: conversion to 'int' from 'std::vector<std::vector<int> >::size_type {aka long unsigned int}' may alter its value [-Werror=conversion]
E = edges.size();
~~~~~~~~~~^~
cc1plus: all warnings being treated as errors
