Driving

input/code.cpp: In function 'int main()':
input/code.cpp:20:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=0;i<dist.size();i++) {
                              ^

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

int main() {
    cin.sync_with_stdio(false);
    ll n, p;
    cin >> n >> p;
    vector<int> dist;
    sort(dist.begin(), dist.end());
    for (ll i=0;i<n;i++) {
        ll a;
        cin >> a;
        dist.push_back(a);
    }

    ll best = 0;

    for (int i=0;i<dist.size();i++) {
        best = max(best, p*(i+1) - i);
    }

    cout << best << endl;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: ACCEPTED

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: ACCEPTED

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: WRONG ANSWER

Test 12

Verdict: WRONG ANSWER

Test 13

Verdict: ACCEPTED