Score : $600$ points

问题描述

考虑一个长度为 $N$，由 0 和 1 组成的序列 $A=(A_1,A_2,\dots,A_N)$，满足以下条件：

对于所有 $i=1,2,\dots,M$，在 $A_{L_i}, A_{L_i+1}, \dots, A_{R_i}$ 这些位置上至少有 $X_i$ 个 1 出现。

请打印出这样一个序列，使得其中 1 的出现次数达到最少。

根据约束条件，始终存在满足条件的序列。

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

Consider a sequence of length $N$ consisting of 0s and 1s, $A=(A_1,A_2,\dots,A_N)$, that satisfies the following condition.

For every $i=1,2,\dots,M$, there are at least $X_i$ occurrences of 1 among $A_{L_i}, A_{L_i+1}, \dots, A_{R_i}$.

Print one such sequence with the fewest number of occurrences of 1s.

There always exists a sequence that satisfies the condition under the Constraints.

Constraints

• $1 \leq N \leq 2 \times 10^5$
• $1 \leq M \leq \min(2 \times 10^5, \frac{N(N+1)}{2} )$
• $1 \leq L_i \leq R_i \leq N$
• $1 \leq X_i \leq R_i-L_i+1$
• $(L_i,R_i) \neq (L_j,R_j)$ if $i \neq j$.
• All values in input are integers.

Input

Input is given from Standard Input in the following format:

$N$ $M$

$L_1$ $R_1$ $X_1$

$L_2$ $R_2$ $X_2$

$\vdots$

$L_M$ $R_M$ $X_M$

Output

Print a sequence $A$ consisting of 0s and 1s, with spaces in between.

$A_1$ $A_2$ $\dots$ $A_N$

It must satisfy all the requirements above.

Sample Input 1

6 3
1 4 3
2 2 1
4 6 2

Sample Output 1

0 1 1 1 0 1 

Another acceptable output is 1 1 0 1 1 0.
On the other hand, 0 1 1 1 1 1, which has more than the fewest number of 1s, is unacceptable.

Sample Input 2

8 2
2 6 1
3 5 3

Sample Output 2

0 0 1 1 1 0 0 0 

update @ 2024/3/10 09:35:38