POJ A Simple Problem with Integers

一道模板题，输入数组in【】一开始设置成longlongWA了一下午！！！！ 

下面代码注释处应为int，引以为戒！

#include <stdlib.h>
#include <cstdio>
#include <iostream>
#include <queue>
#include <stack>
#include <string.h>
#include <math.h>
#include <algorithm>

#define mem(t, v)   memset ((t) , v, sizeof(t))
#define INF 0x3f3f3f3f
#define eps 1e-8
typedef long long ll;

using namespace std;

const int MAX=100010;
int t,n,m;
ll in[MAX];//！ 此处应为int
char cmd[10];
struct node{
    int l,r;
    ll sum,id;
}tree[MAX<<2];

void push_down(int i){
    ll k=tree[i].id;
    if(k!=0){
        tree[i<<1].id+=k;
        tree[i<<1|1].id+=k;
        tree[i<<1].sum+=(tree[i<<1].r-tree[i<<1].l+1)*k;
        tree[i<<1|1].sum+=(tree[i<<1|1].r-tree[i<<1|1].l+1)*k;
        tree[i].id=0;
    }
}

void Build(int i,int l,int r){
    tree[i].l=l,tree[i].r=r,tree[i].id=0;
    if(l==r){
        tree[i].sum=in[l];
        return ;
    }
    int mid=(l+r)>>1;
    Build(i<<1,l,mid);
    Build(i<<1|1,mid+1,r);
    tree[i].sum=tree[i<<1].sum+tree[i<<1|1].sum;
}

void Update(int i,int l,int r,int k){
    if(tree[i].l>=l&&tree[i].r<=r){
        tree[i].id+=k;
        tree[i].sum+=k*(tree[i].r-tree[i].l+1);
        return ;
    }
    if(tree[i].l>r||tree[i].r<l)return;
    push_down(i);
    if(tree[i<<1].r>=l)Update(i<<1,l,r,k);
    if(tree[i<<1|1].l<=r)Update(i<<1|1,l,r,k);
    tree[i].sum=tree[i<<1].sum+tree[i<<1|1].sum;
}

ll Search(int i,int l,int r){
    if(tree[i].l>=l&&tree[i].r<=r){
//        printf("%d %lld %d*%d %d\n",i,tree[i].sum,k,tree[i].l,tree[i].r);
        return tree[i].sum;
    }
    if(tree[i].l>r||tree[i].r<l)return 0;
    push_down(i);
    ll s=0;
    if(tree[i<<1].r>=l)s+=Search(i<<1,l,r);
    if(tree[i<<1|1].l<=r)s+=Search(i<<1|1,l,r);
    return s;
}

int main(){
    while(scanf("%d%d",&n,&m)!=EOF){
        for(int i=1;i<=n;i++){
            scanf("%d",&in[i]);
        }
        Build(1,1,n);
    //        for(int i=0;i<=2*n;i++)
    //            printf("%d %d %d %d++\n",i,tree[i].l,tree[i].r,tree[i].sum);
        while(m--){
            int a,b;
            char cmd[10];
            scanf("%s%d%d",cmd,&a,&b);
            if(cmd[0]=='Q'){
                ll ans=Search(1,a,b);
                printf("%lld\n",ans);
            }
            else if(cmd[0]=='C'){
                ll c;
                scanf("%d",&c);
                Update(1,a,b,c);
            }
        }
    }
    return 0;
}