把长度转成右端点,按右端点排升序,f[i]=max(f[j]&&r[j]<l[i]),因为r是有序的,所以可以直接二分出能转移的区间(1,w),然后用树状数组维护区间f的max,每次转移的时候直接从树状数组上查询前缀max即可,然后把更新出来的f[i]update进树状数组 #include<iostream> #include<cstdio> #include<algorithm> using namespace std; const int N…
1664: [Usaco2006 Open]County Fair Events 参加节日庆祝 Time Limit: 5 Sec Memory Limit: 64 MBSubmit: 255 Solved: 185[Submit][Status][Discuss] Description Farmer John has returned to the County Fair so he can attend the special events (concerts, rodeos, coo…
Description Farmer John has returned to the County Fair so he can attend the special events (concerts, rodeos, cooking shows, etc.). He wants to attend as many of the N (1 <= N <= 10,000) special events as he possibly can. He's rented a bicycle so h…
Description Farmer John has returned to the County Fair so he can attend the special events (concerts, rodeos, cooking shows, etc.). He wants to attend as many of the N (1 <= N <= 10,000) special events as he possibly can. He's rented a bicycle so h…
先按照结束时间进行排序,取第一个节日的结束时间作为当前时间,然后从第二个节日开始搜索,如果下一个节日的开始时间大于当前的时间,那么就参加这个节日,并更新当前时间 #include <bits/stdc++.h> using namespace std; typedef long long ll; const int maxn = 1e4+5; struct node { int be, ed; // 开始时间和结束时间 }nds[maxn]; bool cmp(node x, node y)…
裸的区间dp,设f[i][j]为区间(i,j)的答案,转移是f[i][j]=max(f[i+1][j]+a[i](n-j+i),f[i][j-1]+a[j]*(n-j+i)); #include<iostream> #include<cstdio> using namespace std; const int N=2005; int n,a[N],f[N][N]; int main() { scanf("%d",&n); for(int i=1;i<…
最长上升子序列.虽然数据可以直接n方但是另写了个nlogn的 转移:f[i]=max(f[j]+1)(a[j]<a[i]) O(n^2) #include<iostream> #include<cstdio> using namespace std; const int N=5005; int n,a[N],f[N],ans; int read() { int r=0,f=1; char p=getchar(); while(p>'9'||p<'0') { if(…
[Usaco2006 Open]County Fair Events 参加节日庆祝 Time Limit: 5 Sec Memory Limit: 64 MBSubmit: 487 Solved: 344[Submit][Status][Discuss] Description Farmer John has returned to the County Fair so he can attend the special events (concerts, rodeos, cooking s…
题目 1665: [Usaco2006 Open]The Climbing Wall 攀岩 Time Limit: 5 Sec Memory Limit: 64 MBSubmit: 197 Solved: 95[Submit][Status] Description One of the most popular attractions at the county fair is the climbing wall. Bessie wants to plan her trip up the…
1648: [Usaco2006 Dec]Cow Picnic 奶牛野餐 Time Limit: 5 Sec Memory Limit: 64 MBSubmit: 554 Solved: 346[Submit][Status][Discuss] Description The cows are having a picnic! Each of Farmer John's K (1 <= K <= 100) cows is grazing in one of N (1 <= N <…
1657: [Usaco2006 Mar]Mooo 奶牛的歌声 Time Limit: 5 Sec Memory Limit: 64 MBSubmit: 631 Solved: 445[Submit][Status][Discuss] Description Farmer John's N (1 <= N <= 50,000) cows are standing in a very straight row and mooing. Each cow has a unique height…
有点类似背包 , 就是那样子搞... ------------------------------------------------------------------------------------ #include<cstdio> #include<cstring> #include<algorithm> #include<iostream> #define rep( i , n ) for( int i = 0 ; i < n ; ++i…
裸的LIS ----------------------------------------------------------------- #include<cstdio> #include<cstring> #include<algorithm> #include<iostream> #define rep( i , n ) for( int i = 0 ; i < n ; ++i ) #define clr( x , c ) memset…
dp( L , R ) = max( dp( L + 1 , R ) + V_L * ( n - R + L ) , dp( L , R - 1 ) + V_R * ( n - R + L ) ) 边界 : dp( i , i ) = V[ i ] * n -------------------------------------------------------------------------------------------- #include<cstdio> #include&l…
线段树.. -------------------------------------------------------------------------------------- #include<cstdio> #include<cstring> #include<algorithm> #include<iostream> #define rep( i , n ) for( int i = 0 ; i < n ; i++ ) #define…
题目 1652: [Usaco2006 Feb]Treats for the Cows Time Limit: 5 Sec Memory Limit: 64 MBSubmit: 234 Solved: 185[Submit][Status] Description FJ has purchased N (1 <= N <= 2000) yummy treats for the cows who get money for giving vast amounts of milk. FJ se…
题目 1651: [Usaco2006 Feb]Stall Reservations 专用牛棚 Time Limit: 10 Sec Memory Limit: 64 MBSubmit: 553 Solved: 307[Submit][Status] Description Oh those picky N (1 <= N <= 50,000) cows! They are so picky that each one will only be milked over some preci…
