Submission #477891

#	Time	Username	Problem	Language	Result	Execution time	Memory
477891		chungdinh	Rasvjeta (COCI17_rasvjeta)	C++14	50 / 50	1 ms	296 KiB

rasjveta

#include <iostream>
#include <vector>
#include <bitset>
#include <queue>
#include <algorithm>
#include <cstring>
#include <cmath>
#include <stack>
#include <set>
#include <map>
#include <cassert>
#include <bits/stdc++.h>

using namespace std;

#define pb push_back

#define ll long long
#define ii pair<int,int>
#define pll pair<long long, long long>
#define fi first
#define se second
#define r first
#define c second

#define all(x) x.begin(), x.end()

ostream& operator << (ostream& os, pair<int, int> a) {
    return os << a.first << " : " << a.second;
}

#define endl '\n'
#define db(val) "["#val" = "<<(val)<<"] "
#define cntbit(x) __builtin_popcount(x)

const int N = 1000 + 5;
const int iINF = 1e9;
const ll MOD = 1e9 + 7;
const ll MOD2 = 998244353;
const ll INF = 1e18;

int n, m, k;
int a[N];

int main() {
    #ifdef CHUNGDINH
    freopen("main.inp","r",stdin);
    //freopen("main.out","w",stdout);
    #endif

    int res = 0;

    cin >> n >> m >> k;
    for (int i = 1; i <= m; i++) cin >> a[i];
    sort(a + 1, a + 1 + m);

    int last = 0;
    for (int i = 1; i <= m; i++) {
        if (a[i] - k > last + 1) res += ceil(double(a[i] - k - 1 - (last + 1) + 1) / double(2 * k + 1));
        last = a[i] + k;
    }

    if (last < n) res += ceil(double(n - (last + 1) + 1) / double(2 * k + 1));
    cout << res;
}

/*
Array bounds *
long long vs int
Garbage value
Sometimes, VNOI views "arrays out of bounds" as "wrong answer"
*/

• Subtask 1: 50 / 50