ShaysXIA/CodeInsightBench huggingface dataset:
Problem: 2063C - Remove Exactly Two
Language: C++17 (GCC 7-32)


Submission (verdict: Wrong answer on test 2):
#include <bits/stdc++.h>
using namespace std;
#define F(i, s, e) for(int i = s; i < e; i++)
#define int long long
#define vi vector<int>
#define pb push_back
#define sp <<' '<<
#define endl '\n'
#define pii pair<int, int>
#define fi first
#define se second

const int inf = 1e15;
const int N = 1e5 + 5;

vi adj[N];
int dp[N];
int p[N];

void dfs(int node, int par) {
    p[node] = node;
    dp[node] = 1;
    for(int ch : adj[node]) if(ch != par) {
        dfs(ch, node);
        dp[node] = max(dp[node], dp[ch]);
        dp[node] = max(dp[node], (int) adj[ch].size());
    }
}

void solve() {
    int n;
    cin >> n;

    F(i, 0, n) adj[i].clear();

    F(i, 0, n-1) {
        int u, v;
        cin >> u >> v;
        u--, v--;
        adj[u].pb(v);
        adj[v].pb(u);
    }

    dfs(0, 0);

    //F(i, 0, n) cout << dp[i] << " ";
    //cout << endl;

    int ans = 0;

    F(i, 0, n) {
        int bestChild = 0;
        for(int ch : adj[i]) if(ch != p[i]) {
            if(adj[ch].size() > 1) bestChild = max(bestChild, dp[ch]);
            bestChild = max(bestChild, ((int) adj[ch].size()) - 1);
        }
        ans = max(ans, (int) adj[i].size() - (i != 0) - 1 + bestChild);
    }

    cout << ans << endl;
}

int32_t main() {
    cin.tie(0); ios_base::sync_with_stdio(0);
    #ifdef Local

        freopen("io.in", "r", stdin);
        freopen("io.out", "w", stdout);
    #endif
    int t = 1;
    cin >> t;
    while(t--) solve();
}
Problem: 2052A - Adrenaline Rush
Language: C++20 (GCC 13-64)


Submission (verdict: Wrong answer on test 4):
#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using pi=pair<int,int>;
#define fi first
#define se second
const int N=1e5+5,mod=1e9+7;
int n,m,a[N],b[N],vis[2005][2005];
vector<pi>as;
void solve() {
    cin>>n;
    for(int i=1,x;i<=n;i++)cin>>b[i],a[b[i]]=i;
    for(int i=1;i<=n;i++) {
        for(int j=1;j<n;j++)if(a[j]>a[j+1])as.push_back({b[a[j+1]],b[a[j]]}),swap(a[j],a[j+1]);
    }
    for(pi i:as)vis[i.fi][i.se]=vis[i.se][i.fi]=1;
    for(int i=1;i<n;i++)if(!vis[b[i]][b[i+1]])as.push_back({b[i+1],b[i]}),as.push_back({b[i],b[i+1]});
    cout<<as.size()<<'\n';
    for(pi i:as)cout<<i.fi<<' '<<i.se<<'\n';
}
int main() {
    #ifndef ONLINE_JUDGE
    freopen(".in","r",stdin);
    freopen(".out","w",stdout);
    #endif
    ios::sync_with_stdio(0),cin.tie(0);
    int tt=1;//cin>>tt;
    while(tt--)solve();
    return 0;
}
Problem: 2052A - Adrenaline Rush
Language: C++20 (GCC 13-64)

Previous submission (verdict: Wrong answer on test 4):
#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using pi=pair<int,int>;
#define fi first
#define se second
const int N=1e5+5,mod=1e9+7;
int n,m,a[N],b[N],c[N],vis[2005][2005];
vector<pi>as;
void solve() {
    cin>>n;
    for(int i=1,x;i<=n;i++)cin>>b[i],c[b[i]]=i,a[i]=i;
    for(int i=1;i<=n;i++) {
        for(int j=1;j<n;j++)if(c[a[j]]>c[a[j+1]])as.push_back({a[j+1],a[j]}),swap(a[j],a[j+1]);
    }
    for(pi i:as)vis[i.fi][i.se]=vis[i.se][i.fi]=1;
    for(int i=1;i<n;i++)if(!vis[b[i]][b[i+1]])as.push_back({b[i+1],b[i]}),as.push_back({b[i],b[i+1]});
    cout<<as.size()<<'\n';
    for(pi i:as)cout<<i.fi<<' '<<i.se<<'\n';
}
int main() {
    #ifndef ONLINE_JUDGE
    freopen(".in","r",stdin);
    freopen(".out","w",stdout);
    #endif
    ios::sync_with_stdio(0),cin.tie(0);
    int tt=1;//cin>>tt;
    while(tt--)solve();
    return 0;
}

Submission (verdict: Accepted):
#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using pi=pair<int,int>;
#define fi first
#define se second
const int N=1e5+5,mod=1e9+7;
int n,m,a[N],b[N],c[N],vis[2005][2005];
vector<pi>as;
void solve() {
    cin>>n;
    for(int i=1,x;i<=n;i++)cin>>a[i];
    for(int i=1;i<=n;i++)for(int j=1;j<n;j++)if(a[j]<a[j+1])as.push_back({a[j],a[j+1]}),swap(a[j],a[j+1]);
    for(int i=1;i<=n;i++)for(int j=1;j<n;j++)if(a[j]>a[j+1])as.push_back({a[j],a[j+1]}),swap(a[j],a[j+1]);
    reverse(as.begin(),as.end());
    cout<<as.size()<<'\n';
    for(pi i:as)cout<<i.fi<<' '<<i.se<<'\n';
}
int main() {
    #ifndef ONLINE_JUDGE
    freopen(".in","r",stdin);
    freopen(".out","w",stdout);
    #endif
    ios::sync_with_stdio(0),cin.tie(0);
    int tt=1;//cin>>tt;
    while(tt--)solve();
    return 0;
}
Problem: 2052A - Adrenaline Rush
Language: C++20 (GCC 13-64)

Previous submission (verdict: Wrong answer on test 4):
#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using pi=pair<int,int>;
#define fi first
#define se second
const int N=1e5+5,mod=1e9+7;
int n,m,a[N],b[N],vis[2005][2005];
vector<pi>as;
void solve() {
    cin>>n;
    for(int i=1,x;i<=n;i++)cin>>b[i],a[b[i]]=i;
    for(int i=1;i<=n;i++) {
        for(int j=1;j<n;j++)if(a[j]>a[j+1])as.push_back({b[a[j+1]],b[a[j]]}),swap(a[j],a[j+1]);
    }
    for(pi i:as)vis[i.fi][i.se]=vis[i.se][i.fi]=1;
    for(int i=1;i<n;i++)if(!vis[b[i]][b[i+1]])as.push_back({b[i+1],b[i]}),as.push_back({b[i],b[i+1]});
    cout<<as.size()<<'\n';
    for(pi i:as)cout<<i.fi<<' '<<i.se<<'\n';
}
int main() {
    #ifndef ONLINE_JUDGE
    freopen(".in","r",stdin);
    freopen(".out","w",stdout);
    #endif
    ios::sync_with_stdio(0),cin.tie(0);
    int tt=1;//cin>>tt;
    while(tt--)solve();
    return 0;
}

Submission (verdict: Wrong answer on test 4):
#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using pi=pair<int,int>;
#define fi first
#define se second
const int N=1e5+5,mod=1e9+7;
int n,m,a[N],b[N],c[N],vis[2005][2005];
vector<pi>as;
void solve() {
    cin>>n;
    for(int i=1,x;i<=n;i++)cin>>b[i],c[b[i]]=i,a[i]=i;
    for(int i=1;i<=n;i++) {
        for(int j=1;j<n;j++)if(c[a[j]]>c[a[j+1]])as.push_back({a[j+1],a[j]}),swap(a[j],a[j+1]);
    }
    for(pi i:as)vis[i.fi][i.se]=vis[i.se][i.fi]=1;
    for(int i=1;i<n;i++)if(!vis[b[i]][b[i+1]])as.push_back({b[i+1],b[i]}),as.push_back({b[i],b[i+1]});
    cout<<as.size()<<'\n';
    for(pi i:as)cout<<i.fi<<' '<<i.se<<'\n';
}
int main() {
    #ifndef ONLINE_JUDGE
    freopen(".in","r",stdin);
    freopen(".out","w",stdout);
    #endif
    ios::sync_with_stdio(0),cin.tie(0);
    int tt=1;//cin>>tt;
    while(tt--)solve();
    return 0;
}
Problem: 2063B - Subsequence Update
Language: C++20 (GCC 13-64)

Previous submission (verdict: Runtime error on test 2):
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 1000000007

void solve() {
      int n, l, r;
      cin >> n >> l >> r;
      ll resA = 0, resB = 0;

      vector<int> v(r - l + 1);
      vector<int>  a(r - l + 1, 1e9), b(r - l + 1, 1e9);

      for (int i = 0; i < l - 1; i++) {
            cin >> a[i];
      }

      for (int i = 0; i < r - l + 1; i++) {
            cin >> v[i];
      }

      for (int i = 0; i < n - r; i++) {
            cin >> b[i]; 
      }

      sort(a.begin(),a.end());
      sort(b.begin(),b.end());
      sort(v.rbegin(),v.rend());
 
      for (int i = 0; i < r - l + 1 ; i++) {
            resA += min(v[i], a[i]);
            
      }
      
      for (int i = 0; i < r - l + 1; i++) {
            resB +=  min(v[i], b[i]);  
      }

      cout << min(resA, resB) << endl;

}

int main() {
      ios_base::sync_with_stdio(false);
      cin.tie(nullptr);
#ifndef ONLINE_JUDGE 
      freopen("input.txt", "r", stdin);
      freopen("output.txt", "w", stdout);
#endif
      int t;
      cin >> t;
      while (t--) {
            solve();
      }
      return 0;
}

Submission (verdict: Accepted):
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 1000000007

void solve() {
      int n, l, r;
      cin >> n >> l >> r;
      ll resA = 0, resB = 0;

      vector<int> v(r - l + 1);
      vector<int>  a(max(r - l + 1, l - 1), 1e9), b(max(r - l + 1, n - r), 1e9);

      for (int i = 0; i < l - 1; i++) {
            cin >> a[i];
      }

      for (int i = 0; i < r - l + 1; i++) {
            cin >> v[i];
      }

      for (int i = 0; i < n - r; i++) {
            cin >> b[i]; 
      }

      sort(a.begin(),a.end());
      sort(b.begin(),b.end());
      sort(v.rbegin(),v.rend());
 
      for (int i = 0; i < r - l + 1 ; i++) {
            resA += min(v[i], a[i]);
            
      }
      
      for (int i = 0; i < r - l + 1; i++) {
            resB +=  min(v[i], b[i]);  
      }

      cout << min(resA, resB) << endl;

}

int main() {
      ios_base::sync_with_stdio(false);
      cin.tie(nullptr);
#ifndef ONLINE_JUDGE 
      freopen("input.txt", "r", stdin);
      freopen("output.txt", "w", stdout);
#endif
      int t;
      cin >> t;
      while (t--) {
            solve();
      }
      return 0;
}
Problem: 2063B - Subsequence Update
Language: C++20 (GCC 13-64)

Previous submission (verdict: Wrong answer on test 2):
#include <bits/stdc++.h>

using namespace std;

#define ll long long

#define MOD 1000000007



void solve() {

      int n, l, r;

      cin >> n >> l >> r;

      

      vector<int> v(n);

      ll res = 0;

      for (int i = 0; i < n; i++) {

            cin >> v[i];

      }



      sort(v.begin(), v.end());



      for (int i = 0; i < r - l + 1; i++) {

            res += v[i];

      }



      cout << res << endl;

}



int main() {

      ios_base::sync_with_stdio(false);

      cin.tie(nullptr);

#ifndef ONLINE_JUDGE 

      freopen("input.txt", "r", stdin);

      freopen("output.txt", "w", stdout);

#endif

      int t;

      cin >> t;

      while (t--) {

            solve();

      }

      return 0;

}

Submission (verdict: Runtime error on test 2):
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 1000000007

void solve() {
      int n, l, r;
      cin >> n >> l >> r;
      ll resA = 0, resB = 0;

      vector<int> v(r - l + 1);
      vector<int>  a(r - l + 1, 1e9), b(r - l + 1, 1e9);

      for (int i = 0; i < l - 1; i++) {
            cin >> a[i];
      }

      for (int i = 0; i < r - l + 1; i++) {
            cin >> v[i];
      }

      for (int i = 0; i < n - r; i++) {
            cin >> b[i]; 
      }

      sort(a.begin(),a.end());
      sort(b.begin(),b.end());
      sort(v.rbegin(),v.rend());
 
      for (int i = 0; i < r - l + 1 ; i++) {
            resA += min(v[i], a[i]);
            
      }
      
      for (int i = 0; i < r - l + 1; i++) {
            resB +=  min(v[i], b[i]);  
      }

      cout << min(resA, resB) << endl;

}

int main() {
      ios_base::sync_with_stdio(false);
      cin.tie(nullptr);
#ifndef ONLINE_JUDGE 
      freopen("input.txt", "r", stdin);
      freopen("output.txt", "w", stdout);
#endif
      int t;
      cin >> t;
      while (t--) {
            solve();
      }
      return 0;
}
Problem: 2063B - Subsequence Update
Language: C++20 (GCC 13-64)


Submission (verdict: Wrong answer on test 2):
#include <bits/stdc++.h>

using namespace std;

#define ll long long

#define MOD 1000000007



void solve() {

      int n, l, r;

      cin >> n >> l >> r;

      

      vector<int> v(n);

      ll res = 0;

      for (int i = 0; i < n; i++) {

            cin >> v[i];

      }



      sort(v.begin(), v.end());



      for (int i = 0; i < r - l + 1; i++) {

            res += v[i];

      }



      cout << res << endl;

}



int main() {

      ios_base::sync_with_stdio(false);

      cin.tie(nullptr);

#ifndef ONLINE_JUDGE 

      freopen("input.txt", "r", stdin);

      freopen("output.txt", "w", stdout);

#endif

      int t;

      cin >> t;

      while (t--) {

            solve();

      }

      return 0;

}
Problem: 2063C - Remove Exactly Two
Language: C++20 (GCC 13-64)

Previous submission (verdict: Wrong answer on test 4):
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 1000000007

void solve() {
  int n; cin >> n;
  int k = 2, c = 0;

  vector<vector<int>> adj(n);
  vector<int> in(n);
  priority_queue<pair<int,int>> pq;

  for (int i = 0; i < n - 1; i++) {
        int a, b;
        cin >> a >> b; a--, b--;

        in[a]++; in[b]++;
        adj[a].push_back(b);
        adj[b].push_back(a);
  }


  for (int i = 0; i < n; i++) {
        pq.push({in[i], i});
  }

  while(!pq.empty() && k) {
        auto p = pq.top(); pq.pop();

        if(p.first != in[p.second]) continue;

        c += in[p.second];
        for(auto it : adj[p.second]) {
              in[it]--; 
              pq.push({in[it], it}); 
        }
        k--;
  }

  cout << c - 1 << "\n";
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
#ifndef ONLINE_JUDGE 
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
#endif
  int t;
  cin >> t;
  while (t--) {
    solve();
  }
  return 0;
}

Submission (verdict: Wrong answer on test 4):
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 1000000007

void solve() {
      int n; cin >> n;
      int k = 2, c = 0;

      vector<vector<int>> adj(n);
      vector<int> in(n);
      priority_queue<pair<int,int>> pq;
      vector<bool> vis(n);
      int d[2];

      for (int i = 0, a, b; i < n - 1; i++) { 
            cin >> a >> b; a--, b--;

            in[a]++; in[b]++;

            adj[a].push_back(b);
            adj[b].push_back(a);
      }


      for (int i = 0; i < n; i++) {
            pq.push({in[i], i});
      }

      while(!pq.empty() && k) {
            auto p = pq.top(); pq.pop();

            if(p.first != in[p.second]) continue;
    
            for(auto it : adj[p.second]) {
                  in[it]--; 
                  pq.push({in[it], it});  
            }
 
            k--;
            d[k] = p.second;
      }
      

      auto dfs = [&](auto&& dfs, int n, int p) -> void {
            vis[n] = 1;
            for(auto it : adj[n]) 
                  if(it != p && d[0] != it && d[1] != it) 
                        dfs(dfs, it, n);  
      };

      for(int i = 0; i < n; i++) {
            if(!vis[i] && d[1] != i && d[0] != i) dfs(dfs, i, -1), c++;
      }

      cout << c << "\n";
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
#ifndef ONLINE_JUDGE 
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
#endif
  int t;
  cin >> t;
  while (t--) {
    solve();
  }
  return 0;
}
Problem: 2063C - Remove Exactly Two
Language: C++20 (GCC 13-64)

Previous submission (verdict: Wrong answer on test 4):
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 1000000007

void solve() {
      int n; cin >> n;
      int k = 2, c = 0;

      vector<vector<int>> adj(n);
      vector<int> in(n);
      priority_queue<pair<int,int>> pq;
      vector<bool> vis(n);
      int d[2];

      for (int i = 0, a, b; i < n - 1; i++) { 
            cin >> a >> b; a--, b--;

            in[a]++; in[b]++;

            adj[a].push_back(b);
            adj[b].push_back(a);
      }


      for (int i = 0; i < n; i++) {
            pq.push({in[i], i});
      }

      while(!pq.empty() && k) {
            auto p = pq.top(); pq.pop();

            if(p.first != in[p.second]) continue;
    
            for(auto it : adj[p.second]) {
                  in[it]--; 
                  pq.push({in[it], it});  
            }
 
            k--;
            d[k] = p.second;
      }
      

      auto dfs = [&](auto&& dfs, int n, int p) -> void {
            vis[n] = 1;
            for(auto it : adj[n]) 
                  if(it != p && d[0] != it && d[1] != it) 
                        dfs(dfs, it, n);  
      };

      for(int i = 0; i < n; i++) {
            if(!vis[i] && d[1] != i && d[0] != i) dfs(dfs, i, -1), c++;
      }

      cout << c << "\n";
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
#ifndef ONLINE_JUDGE 
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
#endif
  int t;
  cin >> t;
  while (t--) {
    solve();
  }
  return 0;
}

Submission (verdict: Wrong answer on test 4):
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 1000000007

void solve() {
      int n; cin >> n;
      int k = 2, c = 0;

      vector<vector<int>> adj(n);
      vector<int> in(n);
      priority_queue<pair<int,int>> pq;
      vector<bool> vis(n);
      int d[2];

      for (int i = 0, a, b; i < n - 1; i++) { 
            cin >> a >> b; a--, b--;

            in[a]++; in[b]++;

            adj[a].push_back(b);
            adj[b].push_back(a);
      }


      for (int i = 0; i < n; i++) {
            pq.push({in[i], i});
      }

      while(!pq.empty() && k) {
            auto p = pq.top(); pq.pop();

            if(p.first != in[p.second]) continue;
    
            in[p.second] = 0;
            for(auto it : adj[p.second]) {
                  in[it]--; 
                  pq.push({in[it], it});  
            }
 
            k--;
            d[k] = p.second;
      }
      

      auto dfs = [&](auto&& dfs, int n, int p) -> void {
            vis[n] = 1;
            for(auto it : adj[n]) 
                  if(it != p && d[0] != it && d[1] != it) 
                        dfs(dfs, it, n);  
      };

      for(int i = 0; i < n; i++) {
            if(!vis[i] && d[1] != i && d[0] != i) dfs(dfs, i, -1), c++;
      }

      cout << c << "\n";
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
#ifndef ONLINE_JUDGE 
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
#endif
  int t;
  cin >> t;
  while (t--) {
    solve();
  }
  return 0;
}
Problem: 2063C - Remove Exactly Two
Language: C++20 (GCC 13-64)


Submission (verdict: Wrong answer on test 4):
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 1000000007

void solve() {
  int n; cin >> n;
  int k = 2, c = 0;

  vector<vector<int>> adj(n);
  vector<int> in(n);
  priority_queue<pair<int,int>> pq;

  for (int i = 0; i < n - 1; i++) {
        int a, b;
        cin >> a >> b; a--, b--;

        in[a]++; in[b]++;
        adj[a].push_back(b);
        adj[b].push_back(a);
  }


  for (int i = 0; i < n; i++) {
        pq.push({in[i], i});
  }

  while(!pq.empty() && k) {
        auto p = pq.top(); pq.pop();

        if(p.first != in[p.second]) continue;

        c += in[p.second];
        for(auto it : adj[p.second]) {
              in[it]--; 
              pq.push({in[it], it}); 
        }
        k--;
  }

  cout << c - 1 << "\n";
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
#ifndef ONLINE_JUDGE 
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
#endif
  int t;
  cin >> t;
  while (t--) {
    solve();
  }
  return 0;
}
Problem: 2057C - Trip to the Olympiad
Language: Rust 2021


Submission (verdict: Wrong answer on test 1):
use std::io;

fn main() {
    // Read the number of test cases
    let mut input = String::new();
    io::stdin()
        .read_line(&mut input)
        .expect("Failed to read line");
    let t: usize = input
        .trim()
        .parse()
        .expect("Failed to parse number of test cases");

    // Initialize a vector to hold the test cases
    let mut test_cases = Vec::new();

    // Read each test case
    for _ in 0..t {
        input.clear();
        io::stdin()
            .read_line(&mut input)
            .expect("Failed to read line");
        let nums: Vec<u32> = input
            .trim()
            .split_whitespace()
            .map(|x| x.parse().expect("Failed to parse number"))
            .collect();

        if nums.len() == 2 {
            test_cases.push((nums[0], nums[1]));
        } else {
            panic!("Each test case must contain exactly two numbers");
        }
    }

    // Process each test case
    for (l, r) in test_cases {
        // Replace this with your desired processing logic
        //println!("Processing range: {} to {}", l, r);

        /*
        let l_bin = to_binary(l);
        let r_bin = to_binary(r);
        println!("The binary representation of {} is {}", l, l_bin);
        println!("The binary representation of {} is {}", r, r_bin);
        let mut diff: u32 = r - l;
        let diff_bin = to_binary(diff);
        println!("The binary representation of {} is {}", diff, diff_bin);
        */

        let (mut pow2_bin, mut pow2) = max_power_of_2(l);
        //println!("pow2: {}, pow2_bin: {}", pow2, pow2_bin);

        let upper = r - pow2;
        let lower = l - pow2;
        //println!("lower: {}, upper: {}", lower, upper);
        let up_bin = to_binary(upper);

        //println!("upper: {} upper bin: {}", upper, up_bin);

        let inv_bin = invert_bits(&up_bin);
        //println!("The inverted binary is {}", inv_bin);
        let mut inv = binary_to_u32(&inv_bin).unwrap();
        //println!("inv: {}", inv);

        let mut c: u32 = pow2 + inv;
        if inv == 0 {
            c = l + 1;
        }

        println!("{} {} {}", l, c, r);
        //println!("------");
    }
}

fn to_binary(n: u32) -> String {
    format!("{:b}", n)
}

fn invert_bits(binary: &str) -> String {
    binary
        .chars()
        .map(|c| if c == '0' { '1' } else { '0' })
        .collect()
}

fn binary_to_u32(binary: &str) -> Option<u32> {
    u32::from_str_radix(binary, 2).ok()
}

fn max_power_of_2(l: u32) -> (String, u32) {
    if l == 0 {
        return ("0".to_string(), 0);
    }

    // Find the largest power of 2 less than or equal to l
    let pow2 = 1 << (31 - l.leading_zeros());

    // Convert the value to a binary string
    let binary_representation = format!("{:b}", pow2);

    // Return the binary string and u32 value
    (binary_representation, pow2)
}
Problem: 2063C - Remove Exactly Two
Language: PyPy 3-64

Previous submission (verdict: Wrong answer on test 2):
import io
import os
import sys


inf = 10 ** 18
mod = 10 ** 9 + 7

ONLINE_JUDGE = __debug__

if ONLINE_JUDGE:
    R = io.BytesIO(os.read(0, os.fstat(0).st_size)).readline


    def _input() -> str:
        return R().decode()
else:
    R = sys.stdin.readline


    def _input() -> str:
        return R()


def get_int() -> int:
    return int(_input())


def get_str() -> str:
    return _input().strip()


def get_int_list() -> list[int]:
    return list(map(int, _input().strip().split()))


def init_matrix(n_, m_, value_=0) -> list[list]:
    return [[value_] * m_ for _ in range(n_)]


def get_top(cnt: list[int]) -> int:
    order = sorted(
        range(len(cnt)),
        key=lambda x: cnt[x],
        reverse=True,
    )
    return order[0]


def solve() -> None:
    n = get_int()

    g = init_matrix(n, 0)
    cnt = [0] * n
    for i in range(n - 1):
        u, v = get_int_list()
        u -= 1
        v -= 1
        g[v].append(u)
        g[u].append(v)
        cnt[u] += 1
        cnt[v] += 1

    u = get_top(cnt)
    ans = cnt[u]

    cnt[u] = 0
    for v in g[u]:
        cnt[v] -= 1

    u = get_top(cnt)
    ans += cnt[u] - 1

    print(ans)


for _ in range(get_int()):
    solve()


Submission (verdict: Wrong answer on test 2):
import io
import os
import sys


inf = 10 ** 18
mod = 10 ** 9 + 7

ONLINE_JUDGE = __debug__

if ONLINE_JUDGE:
    R = io.BytesIO(os.read(0, os.fstat(0).st_size)).readline


    def _input() -> str:
        return R().decode()
else:
    R = sys.stdin.readline


    def _input() -> str:
        return R()


def get_int() -> int:
    return int(_input())


def get_str() -> str:
    return _input().strip()


def get_int_list() -> list[int]:
    return list(map(int, _input().strip().split()))


def init_matrix(n_, m_, value_=0) -> list[list]:
    return [[value_] * m_ for _ in range(n_)]


def solve() -> None:
    n = get_int()

    g = init_matrix(n, 0)
    cnt = [0] * n
    pairs = set()
    for i in range(n - 1):
        u, v = get_int_list()
        u -= 1
        v -= 1
        g[v].append(u)
        g[u].append(v)
        cnt[u] += 1
        cnt[v] += 1
        pairs.add((u, v))
        pairs.add((v, u))

    order = sorted(
        range(len(cnt)),
        key=lambda x: cnt[x],
        reverse=True,
    )
    u, v = order[:2]
    h = []
    for i in range(n):
        if cnt[i] == cnt[v]:
            h.append(i)

    if cnt[u] != cnt[v]:
        for w in h:
            if (u, w) not in pairs:
                print(cnt[u] + cnt[v] - 1)
                return

        print(cnt[u] + cnt[v] - 2)
    else:
        for i in range(len(h)):
            for j in range(i + 1, len(h)):
                if (i, j) not in pairs:
                    print(cnt[u] + cnt[v] - 1)
                    return

        print(cnt[u] + cnt[v] - 2)


for _ in range(get_int()):
    solve()