首页 > 技术文章 > 一个数组中超过一半的元素

mutaohengheng 2016-01-07 08:01 原文

#include <stdio.h>
#include <stdlib.h>

/*
	给定一个n个整型元素的数组a,
	其中有一个元素出现次数超过n/2,
	求这个元素。
*/

int getExceedHalf(int *numbers, int length);

int main(){
	int n;
	while (printf("Please input n:\n"), fflush(stdin), scanf("%d", &n) != EOF){
		if (n < 1){
			printf("Please input a bigger number.\n");
			continue;
		}
		int *numbers = (int*)malloc(n*sizeof(int));
		printf("Please input %d number:\n",n);
		for (int i = 0; i < n; ++i)
			scanf("%d",numbers + i);
		printf("The number is: %d\n",getExceedHalf(numbers,n));
	}
	system("pause");
	return 0;
}

int getExceedHalf(int *numbers, int length){
	int number = numbers[0];
	int count = 1;
	for (int i = 1; i < length; ++i){
		if (numbers[i] == number)
			count++;
		else if (count > 0)
			count--;
		else{
			count = 1;
			number = numbers[i];
		}
	}
	return number;
}

  

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