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Calculate Number Frequency

2024-07-14 14:46:52   220人阅读

腾讯面试题：
给你 10 分钟时间，根据上排给出十个数，在其下排填出对应的十个数，
要求下排每个数都是先前上排那十个数在下排出现的次数。
上排的十个数如下：

【0，1，2，3，4，5，6，7，8，9】

举一个例子，
数值: 0,1,2,3,4,5,6,7,8,9
分配: 6,2,1,0,0,0,1,0,0,0
0 在下排出现了 6 次，1 在下排出现了 2 次，
2 在下排出现了 1 次，3 在下排出现了 0 次....

以此类推..


package shuai.study.frequency;

/**
 * @author shengshu
 * 
 */
public class NumberFrequency {
	private final int len = 10;

	private int[] numberArray = null;
	private int[] frequencyArray = null;

	public NumberFrequency() {
		numberArray = new int[len];
		frequencyArray = new int[len];
	}

	// Initialize numberArray
	public void initNumberArray() {
		for (int i = 0; i < len; i++) {
			numberArray[i] = i;
		}
	}

	// Get final frequencyArray
	public int[] getFrequencyArray() {
		while (isSetFrequencyArray(numberArray)) {
			isSetFrequencyArray(numberArray);
		}

		return frequencyArray;
	}

	// Whether set frequencyArray according to judging 'frequencyArray[i] != frequency'
	public boolean isSetFrequencyArray(int[] numberArray) {
		boolean setNextFrequencyFlag = false;

		for (int i = 0; i < len; i++) {
			int frequency = getFrequency(numberArray[i]);

			if (frequencyArray[i] != frequency) {
				frequencyArray[i] = frequency;
				setNextFrequencyFlag = true;
			}
		}

		return setNextFrequencyFlag;
	}

	// Get numberArray's element(number) frequency 
	public int getFrequency(int number) {
		int frequency = 0;

		for (int i = 0; i < len; i++) {
			if (frequencyArray[i] == number) {
				frequency++;
			}
		}

		return frequency;
	}

	// Print array
	public void printArray(int[] array) {
		for (int i = 0; i < array.length; i++) {
			System.out.print(array[i] + "\t");
		}
	}

	// Main thread
	public static void main(String[] args) {
		NumberFrequency numberFrequency = new NumberFrequency();

		numberFrequency.initNumberArray();
		int[] frequencyArray = numberFrequency.getFrequencyArray();
		numberFrequency.printArray(frequencyArray);
	}
}



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