hiho1068(RMQ)

Posted 2020-09-09 yijiull

题目连接：https://hihocoder.com/problemset/problem/1068?sid=1069788

RMQ

 1 #include<cstdio>
 2 #include<cstring>
 3 #include<cmath>
 4 #include<algorithm>
 5 using namespace std;
 6 const int maxn=1e6+10;
 7 const int inf=0x3f3f3f3f;
 8 
 9 int dp[maxn][21];
10 
11 int main()
12 {
13     int n;
14     scanf("%d",&n);
15     for(int i=1;i<=n;i++)
16         scanf("%d",&dp[i][0]);
17     for(int i=0;i<21;i++)
18         dp[0][i]=inf;
19         
20     int len=log2(n);
21     for(int j=1;j<=len;j++)
22         for(int i=1;(i+(1<<j)-1)<=n;i++)
23             dp[i][j]=min(dp[i][j-1],dp[i+(1<<j-1)][j-1]);
24     int m,s,e,ans;
25     scanf("%d",&m);
26     while(m--)
27     {
28         scanf("%d%d",&s,&e);
29         int k=log2(e-s+1);
30         ans=min(dp[s][k],dp[e-(1<<k)+1][k]);
31         printf("%d\n",ans);
32     }
33     return 0;
34 
35 }