洛谷 P3130 [USACO15DEC]计数haybalesCounting Haybales
题目描述
Farmer John is trying to hire contractors to help rearrange his farm, but so far all of them have quit when they saw the complicated sequence of instructions FJ wanted them to follow. Left to complete the project by himself, he realizes that indeed, he has made the project perhaps more complicated than necessary. Please help him follow his instructions to complete the farm upgrade.
FJ's farm consists of NN fields in a row, conveniently numbered 1 \ldots N1…N. In each field there can be any number of haybales. Farmer John's instructions contain three types of entries:
1) Given a contiguous interval of fields, add a new haybale to each field.
2) Given a contiguous interval of fields, determine the minimum number of haybales in a field within that interval.
3) Given a contiguous interval of fields, count the total number of haybales inside that interval.
FJ像雇佣几个人在他的农场里帮忙，他需要进行很多种操作，请你帮他搞定。
FJ的农场有N块田地排长一行，编号是从1到N的。每一块田地都有很多草包。FJ要进行下面几种操作：
1)给定一段连续的田地，给每一个田地都增加一些新的草包。
2)给定一段连续的田地，找出草包最少的田地有多少草包。
3)给定一段连续的田地，统计一共有多少草包。
输入输出格式
输入格式：
The first line contains two positive integers, NN (1 \leq N \leq 200,0001≤N≤200,000) and
QQ (1 \leq Q \leq 100,0001≤Q≤100,000).
The next line contains NN nonnegative integers, each at most 100,000,
indicating how many haybales are initially in each field.
Each of the next QQ lines contains a single uppercase letter, either M, P or S,
followed by either two positive integers AA and BB (1 \leq A \leq B \leq N1≤A≤B≤N),
or three positive integers AA, BB, and CC (1 \leq A \leq B \leq N1≤A≤B≤N;
1 \leq C \leq 100,0001≤C≤100,000). There will be three positive integers if and only if
the uppercase letter is P.
If the letter is M, print the minimum number of haybales in the interval of fields
from A \ldots BA…B.
If the letter is P, put CC new haybales in each field in the interval of fields
from A \ldots BA…B.
If the letter is S, print the total number of haybales found within interval of
fields from A \ldots BA…B.
输出格式：
A line in the output should appear in response to every 'M' or 'S' entry in FJ's
instructions.
输入输出样例
2
6
3
8
思路：裸的线段树，区间修改+区间查询。标签写着并差集，不知道并差集可不可做。
#include<cstdio> #include<cstring> #include<iostream> #include<algorithm> #define MAXN 200010 using namespace std; int n,m; struct nond{ int l,r; long long min,sum,flag; }tree[MAXN*4]; void up(int now){ tree[now].sum=tree[now*2].sum+tree[now*2+1].sum; tree[now].min=min(tree[now*2].min,tree[now*2+1].min); } void build(int now,int l,int r){ tree[now].l=l; tree[now].r=r; if(tree[now].l==tree[now].r){ scanf("%lld",&tree[now].sum); tree[now].min=tree[now].sum; return ; } int mid=(tree[now].l+tree[now].r)/2; build(now*2,l,mid); build(now*2+1,mid+1,r); up(now); } void down(int now){ tree[now*2].flag+=tree[now].flag; tree[now*2+1].flag+=tree[now].flag; tree[now*2].min+=tree[now].flag; tree[now*2+1].min+=tree[now].flag; tree[now*2].sum+=(tree[now*2].r-tree[now*2].l+1)*tree[now].flag; tree[now*2+1].sum+=(tree[now*2+1].r-tree[now*2+1].l+1)*tree[now].flag; tree[now].flag=0; } void change(int now,int l,int r,long long opt){ if(tree[now].l==l&&tree[now].r==r){ tree[now].min+=opt; tree[now].flag+=opt; tree[now].sum+=(tree[now].r-tree[now].l+1)*opt; return ; } if(tree[now].flag) down(now); int mid=(tree[now].l+tree[now].r)/2; if(r<=mid) change(now*2,l,r,opt); else if(l>mid) change(now*2+1,l,r,opt); else{ change(now*2,l,mid,opt); change(now*2+1,mid+1,r,opt); } up(now); } long long query(int now,int l,int r,int opt){ if(tree[now].l==l&&tree[now].r==r){ if(opt==1) return tree[now].sum; else return tree[now].min; } if(tree[now].flag) down(now); int mid=(tree[now].l+tree[now].r)/2; if(r<=mid) return query(now*2,l,r,opt); else if(l>mid) return query(now*2+1,l,r,opt); else{ if(opt==1) return query(now*2,l,mid,opt)+query(now*2+1,mid+1,r,opt); else return min(query(now*2,l,mid,opt),query(now*2+1,mid+1,r,opt)); } } int main(){ scanf("%d%d",&n,&m); build(1,1,n); for(int i=1;i<=m;i++){ char s[10];int x,y,z; scanf("%s%d%d",s,&x,&y); if(s[0]=='S') cout<<query(1,x,y,1)<<endl; if(s[0]=='M') cout<<query(1,x,y,0)<<endl; if(s[0]=='P'){ scanf("%lld",&z); change(1,x,y,z); } } } /* 4 5 3 1 2 4 M 3 4 S 1 3 P 2 3 1 M 3 4 S 1 3 */
