Codeforces 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>

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