980C - Posterized - CodeForces Solution

#include<bits/stdc++.h>
#define _ ios::sync_with_stdio(0),cout.tie(0),cin.tie(0);
using namespace std;
int n, k, i, l, r, p, clr[256];
int main()
{_
    memset(clr, -1, sizeof clr);
    for (cin >> n >> k; i < n; i++){
        cin >> p;
        if (~clr[p]) cout << clr[p] << " ";
        else {
            l = r = p;
            while (r - l + 1 < k && l && clr[l - 1] == -1) l--;
            if (l && ~clr[l - 1] && p - clr[l - 1] + 1 <= k) l = clr[l - 1];
            /// while (r - l + 1 < k && l < 255 && clr[r + 1] == -1) r++;
            while (l <= r) clr[r] = l, r--;
            cout << l << " ";
        }
    }
    return 0;
}