Gym 101149I I - It's the Police
http://codeforces.com/gym/101149/problem/I
考虑下面这个例子
4 3
1 2
1 3
1 4
应该是选 0 0 1 1这样是最优的,我们不选1号,因为如果选1号作为非法分子点,那么2、3、4也不能有警察了,这不行。
那么究竟选呢?
很明显的一个道理是,选出儿子数最小的那个点,作为非法分子点,那么不放警察的地方就变得小了。
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <algorithm>
#define IOS ios::sync_with_stdio(false)
using namespace std;
#define inf (0x3f3f3f3f)
typedef long long int LL; #include <iostream>
#include <sstream>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <string>
const int maxn = 2e5 + ;
vector<int>son[maxn];
bool vis[maxn];
void work() {
IOS;
int n, m;
cin >> n >> m;
for (int i = ; i <= m; ++i) {
int u, v;
cin >> u >> v;
son[u].push_back(v);
son[v].push_back(u);
}
int mi = inf;
int id = inf;
for (int i = ; i <= n; ++i) {
if (son[i].size() < mi) {
mi = son[i].size();
id = i;
}
}
vis[id] = ;
for (int i = ; i < son[id].size(); ++i) {
vis[son[id][i]] = ;
}
for (int i = ; i <= n; ++i) {
printf("%d ", !vis[i]);
}
}
int main() {
#ifdef local
freopen("data.txt","r",stdin);
#endif
work();
return ;
}
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