大的向后排
int[] arr = {12,24,6,18,7,41,21,354,12};
for (int i= 0;i<arr.length-1;i++){
for (int j =0 ;j<arr.length-i-1;j++){
int temp ;
if (arr[j]>arr[j+1]){
temp =arr[j];
arr[j]=arr[j+1];
arr[j+1]=temp;
}
}
}

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