Input a sequence of integers of length n, and output the first m numbers in ascending order.
Input format
The first line contains integers n and m.
The second line contains n integers, representing a sequence of integers.
Output Format
One line contains m integers, representing the first m in the integer sequence.
Data range
1≤m≤n≤105,
1≤elements in the sequence≤109
Input sample:
5 3
4 5 1 3 2Output
sample:
1 2 3
#include<bits/stdc++.h>
using namespace std;
const int N = 100010;
int h[N], idx;
void down(int x)
{
int t = x;
if(x * 2 <= idx && h[t] > h[x * 2]) t = x * 2;
if(x * 2 + 1 <= idx && h[t] > h[x * 2 + 1]) t = x * 2 +1;
if(x != t) {
swap(h[x], h[t]);
down(t);
}
}
void up(int x)
{
while(x / 2 && h[x/2] > h[x]) {
swap(h[x], h[x/2]);
x /= 2;
}
}
int main()
{
int n, m;
cin >> n >> m;
int x;
// for(int i=1; i<=n; i++) {
// cin >> x;
// h[++idx] = x;
// up(idx);
// }
for(int i=1; i<=n; i++) cin >> h[i];
idx = n;
for(int i=n/2; i>=0; i--) down(i);
while(m--) {
cout << h[1] << " ";
h[1] = h[idx];
idx --;
down(1);
}
return 0;
}