Submission #76587

#	Time	Username	Problem	Language	Result	Execution time	Memory
76587		tmwilliamlin168	Swap (BOI16_swap)	C++14	68 / 100	773 ms	263168 KiB

swap

#include <bits/stdc++.h>
using namespace std;

const int mxN=2e5;
int n, a[mxN+1], cdi;
unordered_map<int, int> di[mxN+1];
vector<int> dp[mxN*18*2];

void mrg(vector<int> &v, vector<int> &a, vector<int> &b) {
	for(int l=1, i=0, j=0; i<a.size()||j<b.size(); i+=l, j+=l, l*=2) {
		for(int k=0; k<l&&i+k<a.size(); ++k)
			v.push_back(a[i+k]);
		for(int k=0; k<l&&j+k<b.size(); ++k)
			v.push_back(b[j+k]);
	}
}

int c(int i, int b) {
	auto it=di[i].find(b);
	if(it!=di[i].end())
		return it->second;
	int r=cdi++;
	di[i][b]=r;
	if(2*i+1<=n) {
		if(a[2*i+1]<b&&a[2*i+1]<a[2*i]) {
			vector<int> v1={a[2*i+1]}, v2={a[2*i+1]};
			mrg(v1, dp[c(2*i, a[2*i])], dp[c(2*i+1, b)]);
			mrg(v2, dp[c(2*i, b)], dp[c(2*i+1, a[2*i])]);
			dp[r]=min(v1, v2);
			vector<int>().swap(v1);
			vector<int>().swap(v2);
		} else {
			dp[r]={min(b, a[2*i])};
			mrg(dp[r], dp[c(2*i, max(b, a[2*i]))], dp[c(2*i+1, a[2*i+1])]);
		}
	} else if(2*i<=n)
		dp[r]={min(b, a[2*i]), max(b, a[2*i])};
	else
		dp[r]={b};
	return r;
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> n;
	for(int i=1; i<=n; ++i)
		cin >> a[i];
	for(int b : dp[c(1, a[1])])
		cout << b << " ";
}

Compilation message (stderr)

swap.cpp: In function 'void mrg(std::vector<int>&, std::vector<int>&, std::vector<int>&)':
swap.cpp:10:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int l=1, i=0, j=0; i<a.size()||j<b.size(); i+=l, j+=l, l*=2) {
                         ~^~~~~~~~~
swap.cpp:10:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int l=1, i=0, j=0; i<a.size()||j<b.size(); i+=l, j+=l, l*=2) {
                                     ~^~~~~~~~~
swap.cpp:11:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k=0; k<l&&i+k<a.size(); ++k)
                     ~~~^~~~~~~~~
swap.cpp:13:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k=0; k<l&&j+k<b.size(); ++k)
                     ~~~^~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 11 / 11
• Subtask 3: 27 / 27
• Subtask 4: 20 / 20
• Subtask 5: 0 / 32