// language C with STL(C++)
// 剑指41
// https://leetcode-cn.com/problems/shu-ju-liu-zhong-de-zhong-wei-shu-lcof/
class MedianFinder {
public:
int what[25000];
int next = 0;
/** initialize your data structure here. */
int FindPosition(int num){
// res 满足 what[res-1]<= num, what[res]>num,这两个数都可能不存在
if(what[0] > num) return 0;
if(what[next-1]<=num) return next;
int res = 1;
for(; res<next; res++){
if((what[res-1] <= num) &&(what[res]>num))
return res;
}
// printf("(%d)",next);
// display();
return -1; // 出错
}
void display(){
for(int i =0; i <next; i++)
printf("%dT", what[i]);
printf("\n");
}
MedianFinder() {
}
void addNum(int num) {
// 相当于找到num所在位置index,然后index~next-1位置的数全都后移一位
if(next== 0){
what[next] = num;
next++;
}else{
int position = FindPosition(num);
// printf("%d#",position);
for(int i=next; i>position; i--){
what[i] = what[i-1];
}
what[position] = num;
next++;
}
}
double findMedian() {
double res;
if(next%2 ==1)
res = what[next/2];
else{
// printf("%d-", what[next/2-1]);
// printf("%d-", what[next/2]);
res = what[next/2-1] + what[next/2];
// printf("%d-", res);
res /=2;
}
return res;
}
};
/**
* Your MedianFinder object will be instantiated and called as such:
* MedianFinder* obj = new MedianFinder();
* obj->addNum(num);
* double param_2 = obj->findMedian();
*/