Submission #372267

#	Time	Username	Problem	Language	Result	Execution time	Memory
372267		8e7	Swap (BOI16_swap)	C++14	68 / 100	1088 ms	158768 KiB

swap

//Challenge: Accepted
#include <iostream>
#include <algorithm>
#include <utility>
#include <vector>
#include <unordered_map>
#define ll long long
#define maxn 200005
#define pii pair<int, int>
#define ff first
#define ss second
#define io ios_base::sync_with_stdio(0);cin.tie(0);
using namespace std;
int a[maxn], n;
vector<int> ord;
void getorder(int cur) {
	if (cur * 2 + 1 <= n) getorder(cur * 2 + 1);
	if (cur * 2 <= n) getorder(cur * 2);
	//cout << cur << endl;
	ord.push_back(cur);
}

void merge(vector<int> &v1, vector<int> &v2, vector<int> & ret) {
	for (int i = 0;(1<<(i + 1)) - 1 <= v2.size();i++) {
		for (int j = (1<<i);j < (1<<(i + 1));j++) ret.push_back(v1[j - 1]);
		for (int j = (1<<i);j < (1<<(i + 1));j++) ret.push_back(v2[j - 1]);
		if ((1<<(i + 2)) - 1 > v2.size()) {
			for (int j = (1<<(i + 1)) - 1;j < v1.size();j++) ret.push_back(v1[j]);
			for (int j = (1<<(i + 1)) - 1;j < v2.size();j++) ret.push_back(v2[j]);
			return;
		}
	}
}
vector<int> ind[maxn];
vector< vector<int> > ans[maxn];
inline int search(int v, int x) {
	for (int i = 0;i < ind[v].size();i++) {
		if (ind[v][i] == x) return i;
	}
	//cout << "not found" << endl;
	return -1;
}

void solve(int v, int x, vector<int> &ret) {
	ret.push_back(x);
	bool lef = 2 * v <= n, rig = 2 * v + 1 <= n;
	if (lef && !rig) {
		ret.push_back(a[2 * v]);
		if (a[2 * v] < x) swap(ret[0], ret[1]);
	} else if (lef && rig) {
		int l = a[2 * v], r = a[2 * v + 1], lind = v * 2, rind = v * 2 + 1;
		if (x < l && x < r) {
			merge(ans[lind][search(lind, l)], ans[rind][search(rind, r)], ret);
		} else if (l < x && l < r) {
			ret[0] = l;
			merge(ans[lind][search(lind, x)], ans[rind][search(rind, r)], ret);
		} else {
			ret[0] = r;
			vector<int> v1, v2;
			merge(ans[lind][search(lind, l)], ans[rind][search(rind, x)], v1);
			merge(ans[lind][search(lind, x)], ans[rind][search(rind, l)], v2);
			for (int i = 0;i < v1.size();i++) {
				if (v1[i] < v2[i]) {
					ret.insert(ret.end(), v1.begin(), v1.end());
					break;
				} else if (v1[i] > v2[i]) {
					ret.insert(ret.end(), v2.begin(), v2.end());
					break;
				}
			}
		}
	}
}
int main() {
	io
	cin >> n;
	for (int i = 1;i <= n;i++) cin >> a[i];
	getorder(1);
	for (int cnt = 0;cnt < n;cnt++) {
		int i = ord[cnt];
		int cop = i;
		while (cop) {
			ind[i].push_back(a[cop]);
			if ((cop & 1) && (cop - 1 > 0)) ind[i].push_back(a[cop - 1]);

			cop >>= 1;
		}
		//cout << i << endl;
		for (int x = 0;x < ind[i].size();x++) {
			//cout << ind[i][x] << ": ";
			//cout << 1 << endl;
			vector<int> tmp;
			solve(i, ind[i][x], tmp);
			//for (auto j:tmp) cout << j << " ";
			//cout << endl;
			ans[i].push_back(tmp);
		}
		//cout << endl;
		if (i * 2 <= n) ans[i * 2].clear();
		if (i * 2 + 1 <= n) ans[i * 2 + 1].clear();
	}
	for (int i:ans[1][0]) cout << i << " ";
	cout << "\n";
}
/*
5
3 4 2 5 1
 */

Compilation message (stderr)

swap.cpp: In function 'void merge(std::vector<int>&, std::vector<int>&, std::vector<int>&)':
swap.cpp:24:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |  for (int i = 0;(1<<(i + 1)) - 1 <= v2.size();i++) {
      |                 ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
swap.cpp:27:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |   if ((1<<(i + 2)) - 1 > v2.size()) {
      |       ~~~~~~~~~~~~~~~~~^~~~~~~~~~~
swap.cpp:28:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |    for (int j = (1<<(i + 1)) - 1;j < v1.size();j++) ret.push_back(v1[j]);
      |                                  ~~^~~~~~~~~~~
swap.cpp:29:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |    for (int j = (1<<(i + 1)) - 1;j < v2.size();j++) ret.push_back(v2[j]);
      |                                  ~~^~~~~~~~~~~
swap.cpp: In function 'int search(int, int)':
swap.cpp:37:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |  for (int i = 0;i < ind[v].size();i++) {
      |                 ~~^~~~~~~~~~~~~~~
swap.cpp: In function 'void solve(int, int, std::vector<int>&)':
swap.cpp:62:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |    for (int i = 0;i < v1.size();i++) {
      |                   ~~^~~~~~~~~~~
swap.cpp: In function 'int main()':
swap.cpp:89:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   89 |   for (int x = 0;x < ind[i].size();x++) {
      |                  ~~^~~~~~~~~~~~~~~

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