Submission #1595355

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define FOR(i, n) for(int i = 0; i < (n); i++)
#define MEM(a, x) memset(a, x, sizeof(a))
#define ALL(a) a.begin(), a.end()
#define UNIQUE(a) a.erase(unique(ALL(a)), a.end())
typedef long long ll;

int n, k, a[30];
string s;

int main(int argc, char const *argv[]) {
	ios_base::sync_with_stdio(false);
	cin >> n >> k >> s;
	FOR(i, n) a[s[i]-'a']++;
	int miss = 0;
	string t = "";
	FOR(i, n) {
		FOR(j, 26) {
			if (a[j] == 0) continue;
			char x = 'a'+j;
			if (x == s[i]) {
				t += x;
				a[j]--;
				break;
			}
			else {
				a[j]--;
				int b[30];
				MEM(b, 0);
				for (int p = i+1; p < n; p++) b[s[p]-'a']++;
				int cnt = 1;
				FOR(p, 26) cnt += max(0, b[p]-a[p]);
				if (miss + cnt > k) a[j]++;
				else {
					miss++;
					t += x;
					break;
				}
			}
		}
	}
	cout << t << endl;
	return 0;
}

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