AtCoder Beginner Contest 147
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Problem Statement
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We have $N$ integers. The $i$-th integer is $A_i$.
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Find $\sum_{i=1}^{N-1}\sum_{j=i+1}^{N} (A_i \text{ XOR } A_j)$, modulo $(10^9+7)$.
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What is $\text{ XOR }$? The XOR of integers $A$ and $B$, $A \text{ XOR } B$, is defined as follows: When $A \text{ XOR } B$ is written in base two, the digit in the $2^k$'s place ($k \geq 0$) is $1$ if either $A$ or $B$, but not both, has $1$ in the $2^k$'s place, and $0$ otherwise. For example, $3 \text{ XOR } 5 = 6$. (In base two: $011 \text{ XOR } 101 = 110$.)
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Constraints
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$2 \leq N \leq 3 \times 10^5$$0 \leq A_i < 2^{60}$- All values in input are integers.
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Input
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Input is given from Standard Input in the following format:
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N
A_1 A_2 ... A_N
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Output
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Print the value $\sum_{i=1}^{N-1}\sum_{j=i+1}^{N} (A_i \text{ XOR } A_j)$, modulo $(10^9+7)$.
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样例
Input #1
3
1 2 3
Output #1
6
We have $(1\text{ XOR } 2)+(1\text{ XOR } 3)+(2\text{ XOR } 3)=3+2+1=6$.
Input #2
10
3 1 4 1 5 9 2 6 5 3
Output #2
237
Input #3
10
3 14 159 2653 58979 323846 2643383 27950288 419716939 9375105820
Output #3
103715602
Print the sum modulo $(10^9+7)$.
题目信息
题面与样例版权归 AtCoder 及出题人所有;中文翻译由 AI 生成(CI 管线),如有出入请以原文为准。