ST表

 1 #include <bits/stdc++.h>
 2 using namespace std;
 3 
 4 int st[100000][17];
 5 int meow[100000];
 6 int n;
 7 
 8 void st_init(){
 9     int jmax = floor(log(n)/log(2));
10     for (int i = 0; i < n; i++)
11         st[i][0] = meow[i];
12     for (int j = 1; j <= jmax; j++)
13         for (int i = 0; i < n; i++)
14             if (i + (1 << j) - 1 <= n)
15                 st[i][j] = min(st[i][j - 1], st[i + (1 << (j - 1))][j - 1]);
16 }
17 
18 int st_query(int n, int m){
19     int k = floor(log(m - n + 1) / log(2));
20     return min(st[n][k], st[m - (1 << k) + 1][k]);
21 }
22 
23 int main(){
24     n = 5;
25     for (int i = 0; i < n; i++)
26         cin >> meow[i];
27     st_init();
28     cout << st_query(0, n - 1);
29     return 0;
30 }