POJ 2749|Building roads|2-SAT|二分答案Building roads
#include <cstdio>#include <cstring>#include <cmath>#include <algorithm>using namespace std;#define rep(i,j,k) for(i=j;i<k;++i)#define ms(i) memset(i,0,sizeof(i))const int N = 20005, M = 600000;
