按降序打印数字及其频率
给定一个包含 int 元素的数组,任务是按降序排列元素并找出它们的出现次数。
Input : arr[]={1,1,1,2,2,2,3,3,4,5,6,7,7} Output : 7 occurs: 2 6 occurs: 1 5 occurs: 1 4 occurs: 1 3 occurs: 2 2 occurs: 3 1 occurs: 3
算法
START Step 1 -> input array with elements in sorting order Step 2 -> calculate size of an array by sizeof(a)/sizeof(a[0] Step 3 -> store size in a variable say en Step 4 -> Loop For i=siz-1 and i>0 and i== IF a[i]!=a[i-1] Set to=en-1 Print a[i] and to Set en=i End Step 5 -> print a[0] and to STOP
示例
#include<stdio.h> int main() { int a[]={1,1,1,2,2,2,3,3,4,5,6,7,7}; int siz,i,en,st,to; siz=sizeof(a)/sizeof(a[0]); en=siz; for(i=siz-1;i>0;i--) { if(a[i]!=a[i-1]) { to=en-i; printf("%d occurs: %d
",a[i],to); en=i; } } to=en; printf("%d occurs: %d
",a[0],to); }
输出
如果我们运行以上程序,它会生成以下输出
7 occurs: 2 6 occurs: 1 5 occurs: 1 4 occurs: 1 3 occurs: 2 2 occurs: 3 1 occurs: 3
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