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

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;
}