...1个数,其中某个数重复一次。写一个函数,找出被重复的数字.时间...答:include "iostream.h"void main(){ int arr[] = {6, 2, 3, 4, 3, 5, 1};int N = 7;int sum1, sum2;int i;for(i=1,sum1=0; i<N; sum1+=i,i++);for(i=0,sum2=0; i<N; sum2+=arr[i],i++);cout<<"重复的数字是 "<<sum2-sum1<<endl;} 时间复杂度:O(...