Submission #448605

#	Time	Username	Problem	Language	Result	Execution time	Memory
448605		dxz05	Dancing Elephants (IOI11_elephants)	C++14	50 / 100	9022 ms	2640 KiB

elephants

#pragma GCC optimize("Ofast,unroll-loops,O2")
#pragma GCC target("avx,avx2")

#include "elephants.h"
#include <bits/stdc++.h>

using namespace std;

const int MAXN = 2e5 + 3e2;

int N, L;
int X[MAXN], A[MAXN];
void init(int _N, int _L, int _X[]){
    N = _N;
    L = _L;
    for (int i = 0; i < N; i++) X[i] = _X[i];

    for (int i = 0; i < N; i++) A[i] = X[i];

    sort(A, A + N);

}

int lastans = -1;

int update(int pos, int val){
    if (X[pos] == val && lastans != -1) return lastans;

    int ind = find(A, A + N, X[pos]) - A;
    A[ind] = val;

    if (X[pos] < val) {
        while (ind < N - 1 && A[ind] > A[ind + 1]) {
            swap(A[ind], A[ind + 1]);
            ind++;
        }
    } else {
        while (ind > 0 && A[ind] < A[ind - 1]) {
            swap(A[ind], A[ind - 1]);
            ind--;
        }
    }

    X[pos] = val;

    //for (int i = 0; i < N; i++) cerr << X[i] << ' '; cerr << endl;
    //for (int i = 0; i < N; i++) cerr << A[i] << ' '; cerr << endl << endl;

    int ans = 1, last = A[0];
    int i = 0;

    while (i < N){
        if (A[i] - last > L){
            last = A[i];
            ans++;
        }
        i++;
    }

    lastans = ans;
    return ans;
}

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