bzoj 2016: [Usaco2010]Chocolate Eating【二分+贪心】

二分答案，贪心判断，洛谷上要开long long

#include<iostream>
#include<cstdio>
using namespace std;
const int N=50005;
int n,m,a[N],b[N];
int read()
{
	int r=0,f=1;
	char p=getchar();
	while(p>'9'||p<'0')
	{
		if(p=='-')
			f=-1;
		p=getchar();
	}
	while(p>='0'&&p<='9')
	{
		r=r*10+p-48;
		p=getchar();
	}
	return r*f;
}
bool ok(long long w)
{
	long long nw=0,l=1;
	for(int i=1;i<=m;i++)
	{
		nw>>=1;
		while(nw<w&&l<=n)
			nw+=a[l++];
	}
	return nw>=w;
}
int main()
{
	n=read(),m=read();
	for(int i=1;i<=n;i++)
		a[i]=read();
	long long l=0,r=1e12,ans=0;
	while(l<=r)
	{
		long long mid=(l+r)>>1;
		if(ok(mid))
			l=mid+1,ans=mid;
		else
			r=mid-1;
	}
	printf("%lld\n",ans);
	long long nw=0,w=1;
	for(int i=1;i<=m;i++)
	{
		nw>>=1;
		while(nw<ans&&w<=n)
			nw+=a[w++],printf("%d\n",i);
	}
	for(;w<=n;w++)
		printf("%d\n",m);
	return 0;
}