hdu 3333 离线线段树 + 思维/树状数组 /在线主席树

#include<iostream>
#include<cstdio>
#include<string>
#include<cmath>
#include<cstring>
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll maxn = 30000 + 10;
ll a[30000 + 10];

struct tree
{
    ll l , r;
    ll val;
}t[maxn << 2];

void push_up(ll rt){
    //if(t[rt << 1].val != t[rt << 1|1].val)
    t[rt].val = t[rt << 1].val + t[rt << 1|1].val;
    //else 
      //  t[rt].val += t[rt << 1].val ;
}

void build(ll rt,ll l ,ll r){
    t[rt].l = l;
    t[rt].r = r;
    t[rt].val = 0;
    if(l == r){
        //t[rt].val = a[l];
        return;
    }
    ll mid = (l + r) >> 1;
    build(rt << 1, l , mid);
    build(rt << 1|1,mid+1,r);
    push_up(rt);
}

void updata(ll rt,ll x,ll v){
    if(x == t[rt].l && t[rt].r == x){
        t[rt].val += v;
        return;
    }
    ll mid = (t[rt].l + t[rt].r) >> 1;
    if(x <= mid) updata(rt << 1 , x , v);
    else updata(rt << 1|1, x , v);
    push_up(rt);
}

ll query(ll rt,ll l,ll r){
     if(l <= t[rt].l && r >= t[rt].r) return t[rt].val;
    ll ret  = 0;
    ll mid = (t[rt].l + t[rt].r) >> 1;
    // if(r <= mid) return query(rt << 1, l, r);
    // else if(l > mid) return query(rt << 1|1,l,r);
    // else return query(rt << 1,l,mid) + query(rt << 1|1,mid + 1,r);
    if (l <= mid) ret += query(rt << 1 , l ,r);
    if( r > mid) ret += query(rt << 1|1,l,r);
    push_up(rt);
    return ret;
}





struct node
{
    ll x,y,id;
}nod[100000 + 7];
map<ll,ll> mp;
bool cmp(node s1 ,node s2){
     //if(s1.y == s2.y)
      //   return s1.x < s2.x;
    return s1.y < s2.y;

}
ll ans[100000 + 7];
int main(int argc, char const *argv[])
{
    ll tt;
    scanf("%lld",&tt);
    while(tt--){
        ll n;
        memset(a,0,sizeof a);
        memset(t,0,sizeof t);
        memset(ans,0,sizeof ans);
        mp.clear();
        memset(nod,0,sizeof nod);
        scanf("%lld",&n);
        for(ll i = 1;i <= n ; i++){
            scanf("%lld",&a[i]);
        }
        build(1,1,n);
        ll q;
        scanf("%lld",&q);
        for(ll i = 1;i <= q; i++){
            ll a,b;
            scanf("%lld%d",&a,&b);
        //printf("%lld
",query(1,a,b));
            nod[i].x = a,nod[i].y = b,nod[i].id = i;
        }
        ll i = 0;
        sort(nod + 1,nod + q + 1,cmp);
        
        for(ll j = 1; j <= q;j ++){
        for( ;i <= nod[j].y ; i++){
            if(mp[a[i]])
            //mp[a[i]] = 1;
            
            updata(1,mp[a[i]],-a[i]);
           // mp[a[i]] = 
           //cout << 1 ;
            mp[a[i]] = i;
            updata(1,i,a[i]);
        }
       // cout << 3 << endl ;
     //   cout << nod[j].id << " " << nod[j].x << " " << nod[j].y <<endl;
        ans[nod[j].id] = query(1,nod[j].x,nod[j].y);
       // cout << 1 << endl;
    }
   // cout << 1 ;
    //cout << q << endl;
    for(ll i = 1;i <= q;i ++){
        printf("%lld
",ans[i] );
    }
    }
    return 0;
}