delete pics to save space

1.3865.cpp

@@ -0,0 +1,48 @@
+// luogu-judger-enable-o2
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+const int maxn=1e5+10;
+int n,m,l,r;
+int d[maxn][20];
+int a[maxn];
+void RMQ_init(int *A,int n)
+{
+	for(int i=0;i<n;i++) d[i][0]=A[i];
+	for(int j=1;(1<<j)<=n;j++)
+		for(int i=0;i+(1<<j)-1<n;i++)
+			d[i][j]=max(d[i][j-1],d[i+(1<<(j-1))][j-1]);
+}
+int RMQ(int L,int R)
+{
+	int k=0;
+	while((1<<(k+1))<=R-L+1) k++;
+	return max(d[L][k],d[R-(1<<k)+1][k]);
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d%d",&n,&m);
+	for(int i=0;i<n;i++) scanf("%d",&a[i]);
+	RMQ_init(a,n);
+	while(m-->0)
+	{
+		scanf("%d%d",&l,&r);
+		printf("%d\n",RMQ(l-1,r-1));
+	}
+	return 0;
+}
+/*
+8 8
+9 3 1 7 5 6 0 8
+1 6
+1 5
+2 7
+2 6
+1 8
+4 8
+3 7
+1 8
+*/