Luogu2251 质量检测 (ST表)

我怎么开始划水了。。。

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
#define R(a,b,c) for(register int  a = (b); a <= (c); ++ a)
#define nR(a,b,c) for(register int  a = (b); a >= (c); -- a)
#define Max(a,b) ((a) > (b) ? (a) : (b))
#define Min(a,b) ((a) < (b) ? (a) : (b))
#define Fill(a,b) memset(a, b, sizeof(a))
#define Swap(a,b) a^=b^=a^=b
#define ll long long
#define ON_DEBUG

#ifdef ON_DEBUG

#define D_e_Line printf("\n\n----------\n\n")
#define D_e(x)  cout << #x << " = " << x << endl
#define Pause() system("pause")

#else

#define D_e_Line ;

#endif

struct ios{
    template<typename ATP>ios& operator >> (ATP &x){
        x = 0; int f = 1; char c;
        for(c = getchar(); c < '0' || c > '9'; c = getchar()) if(c == '-')  f = -1;
        while(c >= '0' && c <= '9') x = x * 10 + (c ^ '0'), c = getchar();
        x*= f;
        return *this;
    }
}io;
using namespace std;

const int N = 100007;

int n;

int f[N][18];
int lg[N];
inline void ST_Init(){
	int maxx = lg[n] - 1;
	R(j,1,maxx){
		R(i,1,n + 1 - (1 << j)){
			f[i][j] = Min(f[i][j - 1], f[i + (1 << (j - 1))][j - 1]);
		}
	}
}
inline int Query(int l, int r){
	int k = lg[r - l + 1] - 1;
	return Min(f[l][k], f[r - (1 << k) + 1][k]);
}

int main(){
	int m;
	io >> n >> m;
	R(i,1,n){
		io >> f[i][0];
		lg[i] = lg[i - 1] + ((1 << lg[i - 1]) == i);

	}
	ST_Init();

	n = n - m + 1;
	R(i,1,n){
		printf("%d\n", Query(i, i + m - 1));
	}

	return 0;
}