P1561 [USACO12JAN]爬山Mountain Climbing 题目描述 Farmer John has discovered that his cows produce higher quality milk when they are subject to strenuous exercise. He therefore decides to send his N cows (1 <= N <= 25,000) to climb up and then back down a…
题目描述 Farmer John has discovered that his cows produce higher quality milk when they are subject to strenuous exercise. He therefore decides to send his N cows (1 <= N <= 25,000) to climb up and then back down a nearby mountain! Cow i takes U(i) time…
https://daniu.luogu.org/problemnew/show/P1561 题目描述 Farmer John has discovered that his cows produce higher quality milk when they are subject to strenuous exercise. He therefore decides to send his N cows (1 <= N <= 25,000) to climb up and then back…
l[i],r[i]表示站在i点往左往右走能看到的最高峰,用栈维护凸壳求出 h[i]表示i点能看到的最高峰的高度 a[i],b[i]表示i点往左往右走时反悔的点,即第一个h[j]>h[i]的j,用单调栈求出 然后建树DFS一遍求出答案 #include<cstdio> #define N 200010 typedef long long ll; int n,i,x[N],y[N],l[N],r[N],q[N],a[N],b[N],t,g[N],nxt[N],v[N],ed,d[N],f[N…