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HomeDatabaseMysql TutorialCodeforces Round #241 (Div. 2) D

题目链接:D. Population Size 题意:一些数字,要求分块,使得每一块都是等差数列,但是有些数字是-1,代表任意数字(但是要大于0),问最少需要分几块。 思路:贪心。每次找到相邻两个确定数字,并且记录下第一个数字前有多少个-1,就能确定出公差,然后利

题目链接:D. Population Size


题意:一些数字,要求分块,使得每一块都是等差数列,但是有些数字是-1,代表任意数字(但是要大于0),问最少需要分几块。

思路:贪心。每次找到相邻两个确定数字,并且记录下第一个数字前有多少个-1,就能确定出公差,然后利用公差去判断前面的-1能不能填进去,如果不能ans就多1,然后从第二个确定数字位置开始找,如果可以,就利用公差一直找到能放的最后一个位置,然后下次从那个位置开始找。

细节比较多,代码挫挫的:

#include <stdio.h>
#include <string.h>

const int N = 200005;
__int64 n, i, j;
__int64 a[N];

int main() {
	__int64 ans = 0;
	scanf("%I64d", &n);
	for (i = 0; i  0 && s1 > (a[s] - 1) / d) {
			ans++;
			i = e;
			continue;
		}
		__int64 sum = a[s];
		for (j = s + 1; j <br>
<br>



</string.h></stdio.h>
Statement
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