Submission #798909

#	Time	Username	Problem	Language	Result	Execution time	Memory
798909		boyliguanhan	Swap (BOI16_swap)	C++17	100 / 100	654 ms	4400 KiB

swap

#include<bits/stdc++.h>
#define T(a,b,c) make_tuple(a,b,c)
using namespace std;
int arr[400100],n;
int dp(int i,int v){
	if(i*2>n)
        return 0;
	int x = arr[2*i];
	if(i*2==n)
        return x<v;
	int y=arr[2*i+1];
	if(v<x&&v<y)
        return 0;
	if(x<v&&x<y)
        return 1 + dp(2*i,v);
	if(v<x)
		return min(dp(2*i,v),dp(2*i+1,v))+1;
	int l1 = dp(2*i,x), l2 = dp(2*i+1,x);
	if(l1<=l2)
        return 1 +dp(2*i+1,v);
	return 1+dp(2*i,v);
}
int main() {
    memset(arr, 7, sizeof arr);
    cin >> n;
    for(int i = 1; i <= n; i++)
        cin >> arr[i];
    for(int i = 1; i <= n; i++) {
        int &a=arr[i],&b=arr[i*2],&c=arr[i*2+1];
        if(a<b&&a<c);
        else if(b<a&&b<c)
            swap(a,b);
        else {
            int a2=a,b2=b,c2=c;
            if(a2>b2)
                swap(a2,b2);
            if(dp(2*i,a2)>dp(2*i+1,a2)) swap(a2,b2);
            a = c2;
            b = a2;
            c = b2;
        }
        cout << a << ' ';
    }
}

• Subtask 1: 10 / 10
• Subtask 2: 11 / 11
• Subtask 3: 27 / 27
• Subtask 4: 20 / 20
• Subtask 5: 32 / 32