ACM-ICPC 2018 南京赛区网络预赛 G Lpl and Energy-saving Lamps（模拟+线段树）

Posted 2021-01-04 fht-litost

https://nanti.jisuanke.com/t/30996

题意

每天增加m个灯泡，n个房间，能一次性换就换，模拟换灯泡过程。询问第几天的状态

分析

离线做，按题意模拟。比赛时线段树写挫了。。导致不断超时，我太弱了。每次询问符合要求的最左边的点。

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
#include <algorithm>
#include <cmath>
#include <ctime>
#include <vector>
#include <queue>
#include <map>
#include <stack>
#include <set>
#include <bitset>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define ms(a, b) memset(a, b, sizeof(a))
#define pb push_back
#define mp make_pair
#define pii pair<int, int>
//#define eps 0.0000000001
#define IOS ios::sync_with_stdio(0);cin.tie(0);
#define random(a, b) rand()*rand()%(b-a+1)+a
#define pi acos(-1)
//const ll INF = 0x3f3f3f3f3f3f3f3fll;
const int inf = 0x3f3f3f3f;
const int maxn = 1e5 + 10;
const int maxm = 3000000 +10;
const int mod = 998244353;
struct ND{
    int minn,l,r;
}tree[maxn<<2];

int n,m,k[maxn],d[maxn],q;
void pushup(int rt){
    tree[rt].minn=min(tree[rt<<1].minn,tree[rt<<1|1].minn);
}
void build(int rt,int l,int r){
    tree[rt].l=l,tree[rt].r=r;
    if(l==r){
        tree[rt].minn=k[l];
        return;
    }
    int mid=(l+r)>>1;
    build(rt<<1,l,mid);
    build(rt<<1|1,mid+1,r);
    pushup(rt);
}

void update(int rt,int pos,int val){
    if(tree[rt].l==tree[rt].r){
        tree[rt].minn=val;
        return;
    }
    int mid=(tree[rt].l+tree[rt].r)>>1;
    if(pos<=mid) update(rt<<1,pos,val);
    else update(rt<<1|1,pos,val);
    pushup(rt);
}

int query(int rt,int L,int R,ll val){
    if(tree[rt].minn>val) return inf;
    if(tree[rt].l==tree[rt].r){
        return tree[rt].l;
    }
    int mid=(tree[rt].l+tree[rt].r)>>1;
    if(tree[rt<<1].minn<=val&&L<=mid) return query(rt<<1,L,R,val);
    if(tree[rt<<1|1].minn<=val&&R>mid) return query(rt<<1|1,L,R,val);
}

pair<int,ll> ans[maxn];
bool vis[maxn];
int main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
//    freopen("input.txt", "w", stdout);
#endif
    scanf("%d%d",&n,&m);
    for(int i=1;i<=n;i++) scanf("%d",&k[i]);
    scanf("%d",&q);
    for(int i=1;i<=q;i++) scanf("%d",&d[i]);
    build(1,1,n);
    memset(vis,false,sizeof(vis));
//    cout<<query(1,n,n,7);
    ll sum=m;
    int cnt=0,i;
    for(i=1;i<=1e5+5;i++){
        int x=1;
        while(x<=n){
            if(vis[x]){
                x++;
                continue;
            }
            int tmp=query(1,x,n,sum);
            if(tmp!=inf){
                x=tmp+1;
                sum-=k[tmp];
                vis[tmp]=1;
                cnt++;
                update(1,tmp,inf);
            }else break;
        }
        ans[i]=make_pair(cnt,sum);
        sum+=m;
        if(cnt>=n) break;
    }
    for(int j=1;j<=q;j++){
        if(d[j]>=i){
            printf("%d %lld
",ans[i].first,ans[i].second);
        }else{
            printf("%d %lld
",ans[d[j]].first,ans[d[j]].second);
        }
    }
    return 0;
}