This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
#define int long long
int n, x, idx = 1, a[1000005], bit[1000005], subtree[1000005], ans[1000005];
vector<int> adj[1000005];
int RES = 0;
void add(int pos, int val) {
while(pos <= idx) {
bit[pos] += val;
pos += pos & -pos;
}
}
int get(int x) {
int res = 0;
while(x > 0) {
res += bit[x];
x -= x & -x;
}
return res;
}
int range(int l, int r) {return get(r) - get(l-1);}
void build_sub(int u, int par) {
subtree[u] = 1;
for (int node: adj[u]) {
if(node == par) continue;
build_sub(node, u);
subtree[u] += subtree[node];
}
}
void build(int u) {
cin >> x;
if(x == 0) {
int l, r;
l = idx+1, r = idx+2;
idx+=2;
adj[u].push_back(l);
adj[u].push_back(r);
build(l);
build(r);
}
else if(adj[u].size() == 0) a[u] = x;
}
pair<int,int> dfs2(int u) {
pair<int, int> res = {range(a[u]+1,idx), range(1,a[u]-1)};
for (int node: adj[u]) {pair<int, int> val = dfs2(node); res.first+=val.first,res.second+=val.second;}
return res;
}
void dfs(int u) {
int mx = 0, p = 0;
for (int node: adj[u]) if(mx < subtree[node]) mx = subtree[node], p = node;
if(p == 0) {
add(a[u],1);
return;
}
dfs(p);
if(p == 1) swap(adj[u][0], adj[u][1]), p = 0;
pair<int, int> val = dfs2(adj[u][1]);
RES += min(val.first, val.second);
dfs(adj[u][1]);
}
void solve() {
cin >> n;
build(1);
n = idx;
build_sub(1,-1);
dfs(1);
cout << RES;
}
signed main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
if(fopen("input.inp","r")){
freopen("input.inp", "r", stdin);
freopen("output.out", "w", stdout);
}
int t = 1;
// cin >> t;
while(t--) {
solve();
}
}
Compilation message (stderr)
rot.cpp: In function 'int main()':
rot.cpp:77:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
77 | freopen("input.inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
rot.cpp:78:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
78 | freopen("output.out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
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