Problem:
Score : 600 points

Problem Statement

Silver Fox is fighting with N monsters.

The monsters are standing in a row, and we can assume them to be standing on a number line. The i-th monster, standing at the coordinate X_i, has the health of H_i.

Silver Fox can use bombs to attack the monsters.
Using a bomb at the coordinate x decreases the healths of all monsters between the coordinates x-D and x+D (inclusive) by A.
There is no way other than bombs to decrease the monster's health.

Silver Fox wins when all the monsters' healths become 0 or below.

Find the minimum number of bombs needed to win.

Constraints

1 \leq N \leq 2 \times 10^5

0 \leq D \leq 10^9

1 \leq A \leq 10^9

0 \leq X_i \leq 10^9

1 \leq H_i \leq 10^9

X_i are distinct.

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N D A
X_1 H_1
:
X_N H_N

Output

Print the minimum number of bombs needed to win.

Sample Input 1

3 3 2
1 2
5 4
9 2

Sample Output 1

2

First, let us use a bomb at the coordinate 4 to decrease the first and second monsters' health by 2.

Then, use a bomb at the coordinate 6 to decrease the second and third monsters' health by 2.

Now, all the monsters' healths are 0.
We cannot make all the monsters' health drop to 0 or below with just one bomb.

Sample Input 2

9 4 1
1 5
2 4
3 3
4 2
5 1
6 2
7 3
8 4
9 5

Sample Output 2

5

We should use five bombs at the coordinate 5.

Sample Input 3

3 0 1
300000000 1000000000
100000000 1000000000
200000000 1000000000

Sample Output 3

3000000000

Watch out for overflow.

Solution in C++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <bits/stdc++.h>
using ll = long long;

int main() {
    using namespace std;
    int n, d, a;
    cin >> n >> d >> a;
    vector<pair<int, int>> xh;
    for (int i = 0; i < n; i++) {
        int x, h;
        cin >> x >> h;
        xh.push_back(make_pair(x, h));
    }

    sort(xh.begin(), xh.end());

    ll ans = 0LL;

    // 端っこだけばくは
    while (n > 0) {
        pair<int, int> left = xh[0];
        ll hajikko          = left.second / a + ((left.second % a) ? 1 : 0);
        xh.erase(xh.begin());
        for (int i = 0; i < n; i++) {
            if (xh[i].first <= left.first + 2 * d) {
                xh[i].second -= a * hajikko;
                if (xh[i].second <= 0) {
                    xh.erase(xh.begin() + i);
                    i--;
                    n--;
                }
            } else {
                break;
            }
        }
        ans += hajikko;
    }

    cout << ans << endl;
    return 0;
}