Submission #511035

#	Time	Username	Problem	Language	Result	Execution time	Memory
511035		CodeTiger927	Holiday (IOI14_holiday)	C++17	47 / 100	5081 ms	51348 KiB

holiday

using namespace std;
 
#include <iostream>
#include <vector>
#include <algorithm>
 
#define MAXN 100005
 
pair<long long,int> add(pair<long long,int> a,pair<long long,int> b) {
	return make_pair(a.first + b.first,a.second + b.second);
}
 
int cnt;
 
struct node {
	int lp,rp;
	pair<long long,int> v;
} nodes[20 * MAXN];
 
int build_node(int l,int r) {
	int owo = cnt;
	node& uwu = nodes[cnt++] = node{-1,-1,{0,0}};
	if(l == r) return owo;
	int m = (l + r) >> 1;
	uwu.lp = build_node(l,m);
	uwu.rp = build_node(m + 1,r);
	return owo;
}
 
int get_node(int lp,int rp) {
	int owo = cnt;
	node& uwu = nodes[cnt++] = node{lp,rp,add(nodes[lp].v,nodes[rp].v)};
	return owo;
}
 
int get_node(pair<long long,int> v) {
	int owo = cnt;
	node& uwu = nodes[cnt++] = node{-1,-1,v};
	return owo;
}
 
int upd(int p,int l,int r,int x,pair<long long,int> d) {
	node& uwu = nodes[p];
	if(l == r) return get_node(add(uwu.v,d));
	int m = (l + r) >> 1;
	if(x <= m) return get_node(upd(uwu.lp,l,m,x,d),uwu.rp);
	return get_node(uwu.lp,upd(uwu.rp,m + 1,r,x,d));
}
 
pair<long long,int> get(int p,int l,int r,int a,int b) {
	node& uwu = nodes[p];
	if(a > r || b < l) return make_pair(0,0);
	if(a <= l && b >= r) return uwu.v;
	int m = (l + r) >> 1;
	return add(get(uwu.lp,l,m,a,b),get(uwu.rp,m + 1,r,a,b));
}
 
int st[MAXN];
int N,S,D;
pair<long long,int> dp[MAXN];
 
void solve1(int x,int y,int a,int b) {
	if(x > y) return;
	int z = (x + y) >> 1;
	dp[z] = {-1,-1};
	for(int i = a;i <= b;++i) {
		int l = 0;
		int r = N;
		while(l < r) {
			int m = (l + r + 1) >> 1;
			if(get(st[m],0,N - 1,z,i).second + (S - z) + (i - z) <= D) {
				l = m;
			}else{
				r = m - 1;
			}
		}
		dp[z] = max(dp[z],{get(st[l],0,N - 1,z,i).first,-i});
	}
	if(x == y) return;
	solve1(x,z - 1,a,-dp[z].second);
	solve1(z + 1,y,-dp[z].second,b);
}
 
void solve2(int x,int y,int a,int b) {
	if(x > y) return;
	int z = (x + y) >> 1;
	if(!dp[z].first) dp[z] = {-1,-1};
	for(int i = a;i <= b;++i) {
		int l = 0;
		int r = N;
		while(l < r) {
			int m = (l + r + 1) >> 1;
			if(get(st[m],0,N - 1,i,z).second + (z - S) + (z - i) <= D) {
				l = m;
			}else{
				r = m - 1;
			}
		}
		dp[z] = max(dp[z],{get(st[l],0,N - 1,i,z).first,i});
	}
	if(x == y) return;
	solve2(x,z - 1,a,dp[z].second);
	solve2(z + 1,y,dp[z].second,b);
}

long long int findMaxAttraction(int n, int start, int d, int attraction[]) {
	N = n;
	S = start;
	D = d;
    vector<pair<long long,int>> v;
    for(int i = 0;i < N;++i) {
    	v.push_back({-attraction[i],i});
    }
    st[0] = build_node(0,N - 1);
    sort(v.begin(),v.end());
    for(int i = 0;i < N;++i) {
    	st[i + 1] = upd(st[i],0,N - 1,v[i].second,make_pair(-v[i].first,1));
    }
    solve1(0,S,S,N - 1);
    solve2(S,N - 1,0,S);
    long long ans = 0;
    for(int i = 0;i < N;++i) {
    	ans = max(ans,dp[i].first);
    }
    return ans;
}

Compilation message (stderr)

holiday.cpp: In function 'int get_node(int, int)':
holiday.cpp:32:8: warning: unused variable 'uwu' [-Wunused-variable]
   32 |  node& uwu = nodes[cnt++] = node{lp,rp,add(nodes[lp].v,nodes[rp].v)};
      |        ^~~
holiday.cpp: In function 'int get_node(std::pair<long long int, int>)':
holiday.cpp:38:8: warning: unused variable 'uwu' [-Wunused-variable]
   38 |  node& uwu = nodes[cnt++] = node{-1,-1,v};
      |        ^~~

• Subtask 1: 7 / 7
• Subtask 2: 23 / 23
• Subtask 3: 17 / 17
• Subtask 4: 0 / 53