Submission #1234875

#	Time	Username	Problem	Language	Result	Execution time	Memory
1234875		PenguinsAreCute	Long Distance Coach (JOI17_coach)	C++17	71 / 100	2094 ms	16012 KiB

coach

#include <bits/stdc++.h>
using namespace std;

struct seg {
	int n;
	vector<long long> val;
	seg(int _n): n(_n), val(2*_n,1e18) {}
	void up(int x, long long u) {
		for(x+=n;x;x>>=1)
			val[x] = min(val[x], u);
	}
	long long qry(int l, int r) {
		long long ans = 1e18;
		for(l+=n,r+=n;l<r;l>>=1,r>>=1) {
			if(l&1)
				ans=min(ans,val[l++]);
			if(r&1)
				ans=min(ans,val[--r]);
		}
		return ans;
	}
};

int main() {
	long long x, t, w;
	int n, m;
	cin >> x >> n >> m >> w >> t;
	seg tree(n+1);
	long long s[n+1];
	for(int i=0;i<n;i++)
		cin >> s[i];
	s[n++] = x;
	vector<long long> u(s,s+n);
	for(int i=0;i<n;i++)
		u[i] %= t;
	sort(u.begin(),u.end());
	for(int i=0;i<n;i++) {
		int id = lower_bound(u.begin(),u.end(),s[i]%t)-u.begin();
		tree.up(id,s[i]);
	}

	pair<long long, long long> ppl[m];
	for(int i=0;i<m;i++)
		cin >> ppl[i].first >> ppl[i].second;
	vector<long long> d(m), c(m);
	sort(s,s+n);
	sort(ppl,ppl+m);
	for(int i=0;i<m;i++) {
		d[i] = ppl[i].first, c[i] = ppl[i].second;
		if(d[i] < (x % t))
			c[i] -= w;
	}
	vector<long long> pre(m+1);
	pre[0] = 0;
	partial_sum(c.begin(),c.end(),pre.begin()+1);

	long long dp[m+1];
	memset(dp,1,sizeof(dp));
	dp[m] = 0;
	auto cst = [&d,&u,&pre,&tree,x,m,n,t,w](int j, int i) -> long long {
		long long minT = tree.qry(lower_bound(u.begin(),u.end(),d[i-1])-u.begin(),i==m?n:lower_bound(u.begin(),u.end(),d[i])-u.begin());
		if(minT > 1e17)
			return 1e18;
		minT -= (minT % t);
		long long ans = pre[i] - pre[j];
		ans -= (x - minT) / t * w * (i - j);
		return ans;
	};
	for(int i=m;i;i--) {
		long long cur = 0;
		dp[i-1] = min(dp[i-1], dp[i]);
		for(int j=i;j--;)
			dp[j] = min(dp[j], dp[i] + cst(j, i));
	}

	long long ans = dp[0];
	ans += w * (x / t + 1);
	for(int i=0;i<m;i++)
		ans += w * ((x - d[i]) / t + 1);
	cout << ans;
}

• Subtask 1: 16 / 16
• Subtask 2: 30 / 30
• Subtask 3: 25 / 25
• Subtask 4: 0 / 29