201709-5 除法

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考点:树状数组的应用,如果懂树状数组,那么这个题很轻松拿下

#include<iostream>
#include<sstream>
#include<cstdio>
#include<string>
#include<cstring>
#include<vector>
#include<queue>
#include<map>
#include<set>
#include<ctime>
#include<algorithm>
using namespace std;
#define _for(i,lo,hi) for(int i=(lo);i<(hi);i++)
#define lowbit(i) (i&(-i)) 

int n;
int  A[100005];//开始时把这里也定义为long long类型,所以最后一个算例过不了,只能得90
long long C[100005];
//A[x]加上v 
void updata(int x,int v){
    if(v==0)return;
    for(int i=x;i<n+1;i+=lowbit(i)){
        C[i]+=v;
    }
}
//计算A[1]-A[x]的和 
long long getsum(int x){
    long long sum=0;
    for(int i=x;i>0;i-=lowbit(i)){
        sum+=C[i];
    } 
    return sum;
} 

int main() {
    //freopen("D:\\input.txt","r",stdin);
    int m,opt;
    scanf("%d %d",&n,&m);
    memset(C,0,sizeof(C)); 
    //预处理,生成树状数组
    _for(i,1,n+1){scanf("%d",&A[i]);updata(i,A[i]);} 

    //在线查询
    int l,r,v;   
    _for(i,0,m){
        scanf("%d",&opt);
        if(opt==1){
            scanf("%d %d %d",&l,&r,&v);//本来50分 
            if(v==1)continue;//加这一行优化,80分 
            _for(j,l,r+1){
                if(A[j]>=v&&A[j]%v==0){//加上A[i]>=v90分 
                    updata(j,A[j]/v-A[j]);
                    A[j]/=v;
                }
            }
        }else{
            scanf("%d %d",&l,&r);
            printf("%lld\n",getsum(r)-getsum(l-1));
        }
    }
    return 0;
}

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转载自blog.csdn.net/qq_20633793/article/details/82053142