Music in Car CodeForces - 746F (贪心,模拟)

#include <iostream>
#include <algorithm>
#include <cstdio>
#include <math.h>
#include <set>
#include <map>
#include <queue>
#include <string>
#include <string.h>
#include <bitset>
#define REP(i,a,n) for(int i=a;i<=n;++i)
#define PER(i,a,n) for(int i=n;i>=a;--i)
#define hr putchar(10)
#define pb push_back
#define lc (o<<1)
#define rc (lc|1)
#define mid ((l+r)>>1)
#define ls lc,l,mid
#define rs rc,mid+1,r
#define x first
#define y second
#define io std::ios::sync_with_stdio(false)
#define endl ‘\n‘
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
const int P = 1e9+7, INF = 0x3f3f3f3f;
ll gcd(ll a,ll b) {return b?gcd(b,a%b):a;}
ll qpow(ll a,ll n) {ll r=1%P;for (a%=P;n;a=a*a%P,n>>=1)if(n&1)r=r*a%P;return r;}
ll inv(ll x){return x<=1?1:inv(P%x)*(P-P/x)%P;}
//head





const int N = 1e6+10;
int n, w, k;
int a[N], t[N];
pii r[N];
set<pii> s;
set<pii,greater<pii> > res;

int main() {
	scanf("%d%d%d", &n, &w, &k);
	REP(i,1,n) scanf("%d", a+i);
	REP(i,1,n) scanf("%d", t+i), r[i]=pii(t[i]/2,i);
	int now = 1, c = 0, p = 0, ans = 0;
	REP(i,1,n) {
		while (now<=n&&c<k) {
			c += t[now]-r[now].x;
			p += a[now];
			s.insert(r[now]);
			if (s.size()==w+1) {
				c += s.begin()->x;
				res.insert(*s.begin());
				s.erase(s.begin());
			}
			if (c<=k) ans = max(ans, p);
			++now;
		}
		if (res.count(r[i])) res.erase(r[i]);
		if (s.count(r[i])) { 
			s.erase(r[i]), c -= t[i]-r[i].x;
			if (res.size()) {
				c -= res.begin()->x;
				s.insert(*res.begin()), res.erase(res.begin());
			}
		}
		else c -= t[i];
		p -= a[i];
		if (c<=k) ans = max(ans, p);
	}
	printf("%d\n", ans);
}