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题目链接:acm.hdu.edu.cn/showproblem.php?pid=5685
2 ACMlove2015 1 11 8 10 1 testMessage 1 1
6891 9240 88
#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
#define N 1000010
#define ll long long
#define Mod 9973
char ch[N];
struct node
{
int l,r;
ll ans;
} s[N*8];
void init(int l,int r,int k)
{
s[k].l=l;
s[k].r=r;
s[k].ans=1;
if (l==r)
{
s[k].ans=s[k].ans*(ch[l]-28)%Mod;
return ;
}
int mid=(l+r)/2;
init(l,mid,2*k);
init(mid+1,r,2*k+1);
s[k].ans=(s[k*2].ans*s[k*2+1].ans)%Mod;
}
int Search(int l,int r,int k)
{
if(s[k].l==l&&s[k].r==r)
return s[k].ans;
int mid=(s[k].l+s[k].r)/2;
if (l>mid)
return Search(l,r,2*k+1);
else if (r<=mid)
return Search(l,r,2*k);
else
return (Search(mid+1,r,2*k+1)*Search(l,mid,2*k))%Mod;
}
int main()
{
int n,a,b;
ll as;
while (~scanf("%d",&n))
{
scanf("%s",ch);
int len=strlen(ch);
init(0,len-1,1);
for (int i=0; i<n; i++)
{
scanf("%d%d",&a,&b);
if (a>b||a>len||b>len||b<=0||a<=0)
{
printf ("%lld\n",as);
continue;
}
as=Search(a-1,b-1,1);
printf ("%lld\n",as);
}
}
return 0;
}
hdu 5685 Problem A(2016"百度之星" - 资格赛(Astar Round1)——线段树)
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原文地址:http://blog.csdn.net/qiqi_skystar/article/details/51500718