#include<bits/stdc++.h>
#define ll int
#define ld long double
#define fs first
#define sc second
#define debug(y) cout<<y,exit(0)
using namespace std;
typedef pair<ll,ll> LL;
const ll N = 2e5 + 9;
const ll inf = 1e9 + 7;
vector<ll> dp[N][18][2];
ll n,a[N];
bool need[N][18][2];
void Merge(vector<ll> &res,vector<ll> &a,vector<ll> &b){
for (ll i = 0,j = 1;i < a.size();i += j,j *= 2){
for (ll k = i;k < i + j && k < a.size();k++) res.push_back(a[k]);
for (ll k = i;k < i + j && k < b.size();k++) res.push_back(b[k]);
}
}
int main(){
ios_base::sync_with_stdio(NULL); cin.tie(0); cout.tie(0);
#define task "test"
if (fopen(task".inp","r")){
freopen(task".inp","r",stdin);
//freopen(task".out","w",stdout);
}
cin>>n;
for (ll i = 1;i <= n;i++) cin>>a[i];
need[1][0][1] = 1;
for (ll node = 1;node <= n/2;node++){
for (ll i = 0;node >> i;i++){
for (auto j : {0,1}){
if (!need[node][i][j]) continue;
ll p = ((node >> i + 1) << 1) + j;
ll mn = min({a[p],a[node*2],a[node*2 + 1]});
if (mn == a[node*2])
need[2*node][i + 1][j] = need[2*node + 1][0][1] = 1;
else if (mn == a[p])
need[2*node][0][0] = need[2*node + 1][0][1] = 1;
else
need[2*node][0][0] = need[2*node + 1][0][0] = 1,
need[2*node][i + 1][j] = need[2*node + 1][i + 1][j] = 1;
}
}
}
for (ll node = n;node;node--){
for (ll i = 0;node >> i;i++){
for (auto j : {0,1}){
if (!need[node][i][j]) continue;
ll p = ((node >> i + 1) << 1) + j;
if (2*node > n) dp[node][i][j] = {a[p]};
else if (2*node == n) dp[node][i][j] = {min(a[p],a[node*2]),max(a[p],a[node*2])};
else{
ll mn = min({a[p],a[2*node],a[2*node + 1]});
if (mn == a[2*node + 1]){
vector<ll> tmp1,tmp2; tmp1 = tmp2 = {a[2*node + 1]};
Merge(tmp1,dp[2*node][0][0],dp[2*node + 1][i + 1][j]);
Merge(tmp2,dp[2*node][i + 1][j],dp[2*node + 1][0][0]);
dp[node][i][j] = min(tmp1,tmp2);
}
else{
dp[node][i][j] = {min(a[p],a[2*node])};
if (mn == a[p])
Merge(dp[node][i][j],dp[2*node][0][0],dp[2*node + 1][0][1]);
else
Merge(dp[node][i][j],dp[2*node][i + 1][j],dp[2*node + 1][0][1]);
}
}
}
}
if (2*node < n){
for (ll i = 0;2*node >> i;i++){
for (auto j : {0,1})
vector<ll>().swap(dp[2*node][i][j]),
vector<ll>().swap(dp[2*node + 1][i][j]);
}
}
}
for (auto i : dp[1][0][1]) cout<<i<<" ";
}
/* stuff you should look for
* int overflow, array bounds
* special cases (n=1?)
* do smth instead of nothing and stay organized
* WRITE STUFF DOWN
* DON'T GET STUCK ON ONE APPROACH
*/
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
Compilation message
swap.cpp: In function 'void Merge(std::vector<int>&, std::vector<int>&, std::vector<int>&)':
swap.cpp:17:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
17 | for (ll i = 0,j = 1;i < a.size();i += j,j *= 2){
| ~~^~~~~~~~~~
swap.cpp:18:46: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
18 | for (ll k = i;k < i + j && k < a.size();k++) res.push_back(a[k]);
| ~~^~~~~~~~~~
swap.cpp:19:46: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
19 | for (ll k = i;k < i + j && k < b.size();k++) res.push_back(b[k]);
| ~~^~~~~~~~~~
swap.cpp: In function 'int main()':
swap.cpp:38:68: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
38 | ll p = ((node >> i + 1) << 1) + j;
| ~~^~~
swap.cpp:56:68: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
56 | ll p = ((node >> i + 1) << 1) + j;
| ~~^~~
swap.cpp: At global scope:
swap.cpp:95:31: error: expected declaration before '}' token
95 | }
| ^
swap.cpp:96:17: error: expected declaration before '}' token
96 | }
| ^
swap.cpp:97:71: error: expected declaration before '}' token
97 | }
| ^
swap.cpp:98:71: error: expected declaration before '}' token
98 | }
| ^
swap.cpp:99:49: error: expected declaration before '}' token
99 | }
| ^
swap.cpp:100:31: error: expected declaration before '}' token
100 | }
| ^
swap.cpp:101:17: error: expected declaration before '}' token
101 | }
| ^
swap.cpp:102:7: error: expected declaration before '}' token
102 | }
| ^
swap.cpp:103:31: error: expected declaration before '}' token
103 | }
| ^
swap.cpp:104:17: error: expected declaration before '}' token
104 | }
| ^
swap.cpp:105:7: error: expected declaration before '}' token
105 | }
| ^
swap.cpp:106:7: error: expected declaration before '}' token
106 | }
| ^
swap.cpp:107:1: error: expected declaration before '}' token
107 | }
| ^
swap.cpp:108:7: error: expected declaration before '}' token
108 | }
| ^
swap.cpp:109:1: error: expected declaration before '}' token
109 | }
| ^
swap.cpp: In function 'int main()':
swap.cpp:27:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
27 | freopen(task".inp","r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
