hdu 1166 线段树

标签：dp

思路：标准的线段树

代码：

#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stdlib.h>
#include <string.h>
#include <iomanip>
#define N 10005<<1
#define INF 10000000
#define LL long long
#define eps 10E-9
#define mem(a)  memset(a,0,sizeof(a))
#define mem1(a)  memset(a,-1,sizeof(a))
#define w(a)   while(a)
#define s(a)   scanf("%d",&a)
#define ss(a,b)   scanf("%d%d",&a,&b)
#define sss(a,b,c)   scanf("%d%d%d",&a,&b,&c)
#define PI acos(-1.0)
using namespace std;
int n;
int arr[50010];
struct node {
    int left, right, sum;
}s[150008];
void tree_build(int left, int right, int i){
    int mid;
    s[i].left = left;
    s[i].right = right;
    if(left == right){
        s[i].sum = arr[right]; return ;
    }
    mid = (left + right)/2;
    tree_build(left, mid, 2*i);
    tree_build(mid+1, right, 2*i+1);
    s[i].sum = s[2*i].sum + s[2*i+1].sum;
}
void tree_a(int id, int num, int i){
    if(s[i].left == s[i].right){
        s[i].sum += num; return ;
    }
    else{
        s[i].sum += num;
        if(id <= s[2*i].right) tree_a(id, num, 2*i);
        else tree_a(id, num, 2*i+1);
    }
}
int tree_q(int left, int right, int i){
    int mid;
    if(s[i].left == left && s[i].right == right) return s[i].sum;
    mid = (s[i].left + s[i].right)/2;
    if(right <= mid) return tree_q(left, right, 2*i);
    else if(left > mid) return tree_q(left, right, 2*i+1);
    else return tree_q(left, mid, 2*i) + tree_q(mid+1, right, 2*i+1);
}
int main(){
    int t;
    string str;
    s(t);
    int time = 1;
    w(t--){
        s(n);
        printf("Case %d:\n",time++);
        for(int i=1; i<=n; i++){
            s(arr[i]);
        }
        tree_build(1, n ,1);
        int a, b;
        w(1){
           cin>>str;
           if(str =="End") break;
           ss(a,b);
           if(str == "Query") cout<<tree_q(a, b, 1)<<endl;
           if(str == "Add") tree_a(a, b, 1);
           if(str == "Sub") tree_a(a, -b, 1);
        }
    }
    return 0;
}

hdu 1166 线段树

标签：dp

原文地址：http://blog.csdn.net/bigsungod/article/details/46997919