POJ 1754 Buffer Manager G++

#include <iostream>
#include <cstdio>
#include <string> 
#include <algorithm>
using namespace std;
//英语      看博友分析     抄博友程序     模拟 
char s[100010];
int main()
{
	int n,m;
	scanf("%d%d",&n,&m);
	int js=0;
	int he=0;
	int jg=0x7fffffff;
	int pos;
	//string s="*2165745216091853477755800393859785807207523169954341**7363*9*94664808*477771708909825185827659480548";
	for(int i=1;i<=n;i++)
	{
		char ch;
		scanf("%c",&ch);
		s[i]=ch;
		if(s[i]=='\n')
		{
			i--;
		}else if(s[i]=='*')
		{
			js=0;
			he=0;
		}else
		{
			js++;
			if(js>m)
			{
				he=he+s[i]-'0'-(s[i-m]-'0');
				if(jg>he)
				{
					jg=he;
					pos=i-m+1;
					//cout<<jg<<" "<<pos<<endl;
				}
			}else if(js<m)
			{
				he=he+s[i]-'0';
			}else if(js==m)
			{
				he=he+s[i]-'0';
				if(jg>he)
				{
					jg=he;
					pos=i-m+1;
					//cout<<jg<<" "<<pos<<endl;
				}				
			}
			//cout<<i<<" "<<he<<endl;			
		}
	}
	if(jg==0x7fffffff)
	{
		cout<<0<<endl;
	}else
	{
		cout<<pos<<endl;
	}
	return 0; 
}