hdu 4105 贪心思想「建议收藏」

#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<algorithm>
#include<map>

using namespace std;

char data[5999];

int main()
{
	int n, m, k;

	while(scanf("%d", &n) != EOF)
	{
		scanf("%s", data);
		//cout<<data<<endl;
		int a, b, tag = 0;
		a = 11;
		b = 0;
		int ans = 0;
		for(int i = 0; i < n; i ++)
		{
			b = (data[i] - '0');
			if(tag % 2 == 0){
				if(b < a){		
					a = b;
				}
				else
				{	
					i ++;
					a = data[i]-'0';
				}
			}
			else
			{
				if(b > a)
				{
					a = b;
				}
				else
				{
					if(b == 0)
					{
						while(data[i] == '0'){
							i ++;
							if(i >= n) break;	
						}
						//贪心思想，有0就一定让他做波谷，把原先的波谷a给到他的前一个波峰上
						a = 0;	//0做波谷 
						b = data[i]-'0';
						a = b;
					}
					else
					{
						i ++;
						a = b*10 + (data[i] - '0');
					}
				}
			}
			if(i >= n) break;
			ans ++; tag ++;
		}
		printf("%d\n", ans-1);		
	}
	
	return 0;
}