Submission #132596

#	Time	Username	Problem	Language	Result	Execution time	Memory
132596		someone_aa	Holiday (IOI14_holiday)	C++17	47 / 100	238 ms	65540 KiB

holiday

#include <bits/stdc++.h>
#include "holiday.h"
#define ll long long
#define pb push_back
#define mp make_pair
using namespace std;
const int maxn = 100500;
ll value[maxn], d;
int arr[maxn];
 
/*class node {
public:
    ll sum;
    int cnt;
    node *leftchild, *rightchild;
 
    node(ll _sum, ll _cnt) {
        sum = _sum;
        cnt = _cnt;
    }
    node(node *a, node *b) {
        leftchild = a;
        rightchild = b;
 
        sum = a->sum + b->sum;
        cnt = a->cnt + b->cnt;
    }
};*/

vector<ll>sum, cnt, l, r;

int makenewleaf(ll _sum, ll _cnt) {
	sum.pb(_sum);
	cnt.pb(_cnt);
	l.pb(-1);
	r.pb(-1);
	return int(sum.size()-1);
}

int makenewparent(int _l, int _r) {
	sum.pb(sum[_l] + sum[_r]);
	cnt.pb(cnt[_l] + cnt[_r]);
	l.pb(_l);
	r.pb(_r);
	return int(sum.size()-1);
}

int zeroleaf;

int build(int li=1, int ri=d) {
    if(li == ri) return zeroleaf;
    else {
        int mid = (li + ri) / 2;
        return makenewparent(build(li, mid), build(mid+1, ri));
    }
}
 
int update(int curr, ll uind, ll uval, int li=1, int ri=d) {
    if(li == ri) {
        return makenewleaf(sum[curr] + uval, cnt[curr] + 1);
    }
    else {
        int mid = (li + ri) / 2;
        if(uind <= mid) return makenewparent(update(l[curr], uind, uval, li, mid), r[curr]);
        else return makenewparent(l[curr], update(r[curr], uind, uval, mid+1, ri));
    }
}
 
ll solve(int p, int pm, ll k, int li=1, int ri=d) {
    ll total = cnt[p] - cnt[pm];
 
    //cout<<li<<" "<<ri<<" -> "<<total<<", "<<k<<"\n";
    if(k == 0) return 0LL;
    if(total < k) return (sum[p] - sum[pm]);
 
    if(li == ri) {
        return k * value[li];
    }
    else {
        int mid = (li + ri) / 2;
 
        ll total_right = cnt[r[p]] - cnt[r[pm]];
        if(total_right >= k) return solve(r[p], r[pm], k, mid+1, ri);
        else return (sum[r[p]] - sum[r[pm]]) + solve(l[p], l[pm], k - total_right, li, mid);
    }
}
 
int prefix[maxn];
set<int>st;
map<int,int>ind;
int n, start, c;
ll dp[maxn];
 
void solvedp(int l=1, int r=start, int optl=start, int optr=n) {
    if(l > r) return;
    int mid = (l + r) / 2;
 
    // calculate dp[mid]
    dp[mid] = -1;
    int optmid = -1;
    for(int i=optl;i<=optr;i++) {
        ll walk = i - mid + min(start - mid, i - start);
        ll curr = solve(prefix[i], prefix[mid-1], max(0LL, c - walk));
        if(curr > dp[mid]) {
            dp[mid] = curr;
            optmid = i;
        }
    }
 
    solvedp(l, mid-1, optl, optmid);
    solvedp(mid+1, r, optmid, optr);
}
 
ll findMaxAttraction(int _n, int _start, int _c, int _attractions[]) {
    //ifstream fin("input.txt");
    n = _n;
    start = _start;
    c = _c;
    //cin>>n>>start>>c;
    start++;
    for(int i=0;i<n;i++) {
        arr[i] = _attractions[i];
        st.insert(arr[i]);
    }
 
    int br = 1;
    for(int i:st) {
        value[br] = i;
        ind[i] = br++;
    }
    d = br - 1;
    for(int i=n-1;i>=0;i--) {
        arr[i+1] = ind[arr[i]];
    }
 
 	zeroleaf = makenewleaf(0LL, 0LL);
    int curr = build();
    prefix[0] = curr;
    for(int i=1;i<=n;i++) {
        prefix[i] = prefix[i-1];
        prefix[i] = update(prefix[i], arr[i], value[arr[i]]);

        //cout<<i<<": "<<sum[prefix[i]]<<"\n";
    }
 
    //cout<<solve(prefix[4], prefix[0], 3)<<"A\n";

    solvedp();
    ll result = 0LL;
    for(int i=1;i<=n;i++) {
        result = max(result, dp[i]);
    }
    return result;
}

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