Educational Codeforces Round 52 (Rated for Div. 2) C. Make It Equal

最新推荐文章于 2020-11-08 01:08:00 发布

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题解

给你n个矩形要求你切最少的刀将矩形切成同样高度要求两刀之间的矩形大小和小于等于k

使用差分求出每个高度的矩形个数模拟一下即可

AC代码

#include <stdio.h>
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

const int INF = 0x3f3f3f3f;
const int MAXN = 2e5 + 10;
int h[MAXN];

int main()
{
#ifdef LOCAL
	freopen("C:/input.txt", "r", stdin);
#endif
	int N, K, x;
	cin >> N >> K;
	for (int i = 1; i <= N; i++)
	{
		scanf("%d", &x);
		h[1]++, h[x + 1]--; //差分
	}
	for (int i = 1; i < MAXN; i++)
		h[i] += h[i - 1];
	int cnt = 0, s = 0;
	for (int i = MAXN - 1; i >= 1; i--)
	{
		if (h[i] == N)
			break;
		if (s + h[i] <= K)
			s += h[i];
		else
			s = h[i], cnt++;
	}
	if (s)
		cnt++;
	cout << cnt << endl;

	return 0;
}