이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
//#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<pair<int, int>> result;
const int N = 2e5 + 7;
inline void upd(result &a, const result &b) {
if (!b.empty() && (a.empty() || b < a)) a = b;
}
inline void merge(const result &a, const result &b, result &res) {
int i = 0, j = 0;
while (i < a.size() || j < b.size()) {
if (i == a.size()) {
res.push_back(b[j++]);
} else if (j == b.size()) {
res.push_back(a[i++]);
} else {
if (a[i] < b[j]) {
res.push_back(a[i++]);
} else res.push_back(b[j++]);
}
}
}
int n, x[N];
vector<int> vals[N];
vector<result> dp[N];
inline int get_ind(int v, int val) {
/*auto it = lower_bound(vals[v].begin(), vals[v].end(), val);
assert(it != vals[v].end() && *it == val);*/
return lower_bound(vals[v].begin(), vals[v].end(), val) - vals[v].begin();
}
void go(int v) {
/*if (v > n) return;
go(2 * v);
go(2 * v + 1);*/
if (2 * v > n) {
for (int i = 0; i < vals[v].size(); ++i) dp[v][i] = {{v, vals[v][i]}};
/*for (int i = 0; i < vals[v].size(); ++i) {
for (auto w : dp[v][i]) cout << w.first << " " << w.second << endl;
cout << endl;
}*/
return;
}
if (2 * v + 1 > n) {
for (int i = 0; i < vals[v].size(); ++i) {
for (int f = 0; f < 2; ++f) {
int val = vals[v][i], val2 = x[2 * v];
if (f) swap(val, val2);
result cur = {{v, val}};
int ind = get_ind(2 * v, val2);
for (auto w : dp[2 * v][ind]) cur.push_back(w);
upd(dp[v][i], cur);
}
}
return;
}
//return;
for (int i = 0; i < vals[v].size(); ++i) {
for (int left = 0; left < 2; ++left) {
for (int right = 0; right < 2; ++right) {
int val = vals[v][i], l = x[2 * v], r = x[2 * v + 1];
if (left) swap(val, l);
if (right) swap(val, r);
if (l < val || r < val) continue;
result cur = {{v, val}};
int lind = get_ind(2 * v, l), rind = get_ind(2 * v + 1, r);
merge(dp[2 * v][lind], dp[2 * v + 1][rind], cur);
upd(dp[v][i], cur);
}
}
}
}
int main() {
#ifdef LOCAL
freopen("input.txt", "r", stdin);
#endif
ios::sync_with_stdio(false);
cin.tie(0);
cin >> n;
for (int i = 1; i <= n; ++i) cin >> x[i];
for (int i = 1; i <= n; ++i) {
vals[i].push_back(x[i]);
for (int j = i; j > 1; j >>= 1) {
vals[i].push_back(x[j >> 1]);
vals[i].push_back(x[j ^ 1]);
}
sort(vals[i].begin(), vals[i].end());
dp[i].resize(vals[i].size());
}
/*for (int i = 1; i <= n; ++i) {
cout << "vals[" << i << "]: ";
for (auto val : vals[i]) cout << val << " ";
cout << endl;
}
return 0;*/
//go(1);
int ptr = n;
for (int i = n; i >= 1; --i) {
while (ptr > 2 * i + 1) {
dp[ptr].clear();
dp[ptr].shrink_to_fit();
--ptr;
}
go(i);
}
int ind = get_ind(1, x[1]);
for (auto i : dp[1][ind]) cout << i.second << " ";
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
swap.cpp: In function 'void merge(const result&, const result&, result&)':
swap.cpp:15:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
15 | while (i < a.size() || j < b.size()) {
| ~~^~~~~~~~~~
swap.cpp:15:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
15 | while (i < a.size() || j < b.size()) {
| ~~^~~~~~~~~~
swap.cpp:16:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
16 | if (i == a.size()) {
| ~~^~~~~~~~~~~
swap.cpp:18:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
18 | } else if (j == b.size()) {
| ~~^~~~~~~~~~~
swap.cpp: In function 'void go(int)':
swap.cpp:43:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
43 | for (int i = 0; i < vals[v].size(); ++i) dp[v][i] = {{v, vals[v][i]}};
| ~~^~~~~~~~~~~~~~~~
swap.cpp:51:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
51 | for (int i = 0; i < vals[v].size(); ++i) {
| ~~^~~~~~~~~~~~~~~~
swap.cpp:64:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
64 | for (int i = 0; i < vals[v].size(); ++i) {
| ~~^~~~~~~~~~~~~~~~
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