Submission #249770

#	Time	Username	Problem	Language	Result	Execution time	Memory
249770		eohomegrownapps	Dancing Elephants (IOI11_elephants)	C++14	0 / 100	1 ms	512 KiB

elephants

#include "elephants.h"
#include <bits/stdc++.h>
using namespace std;
#include <bits/extc++.h>
using namespace __gnu_pbds;
template <typename T>
using pbds_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template <typename T, typename V>
using pbds_map = tree<T, V, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

int n,l;
pbds_set<int> elephants;
vector<int> elpos;
vector<int> dp;

void init(int N, int L, int X[]) {
    n=N;l=L;
    elpos.resize(n);
    for (int i = 0; i<n; i++){
        elpos[i]=X[i];
        elephants.insert(X[i]);
    }
}

int update(int i, int y) {
    elephants.erase(elpos[i]);
    elpos[i]=y;
    elephants.insert(y);
    int ptr = 0;
    for (auto e : elephants){
        int lastel = elephants.order_of_key(e-l);
        if (lastel==0){
            dp[ptr]=1;
        } else {
            dp[ptr]=dp[lastel-1]+1;
        }
        ptr++;
    }
    return dp[n-1];
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 16
• Subtask 3: 0 / 24
• Subtask 4: 0 / 47
• Subtask 5: 0 / 3