Problem: 2057C - Trip to the Olympiad
Language: C++17 (GCC 7-32)

Previous submission (verdict: Wrong answer on test 1):
#include <bits/stdc++.h>
using namespace std;
const char nl = '\n';
const char sp = ' ';
const int inf = 0x3f3f3f3f;
const string OUT[2]{ "NO", "YES" };
const string out[2]{ "No", "Yes" };
#define all(a) a.begin(), a.end()
#define dbg(a) cerr << (#a) << " = " << a << nl
#define OK() cerr << "OK until line " << __LINE__ << nl
using ll = long long;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
ifstream fin(".in");
ofstream fout(".out");

auto start_time = chrono::high_resolution_clock::now();

double amcbn() {
    auto end_time = chrono::high_resolution_clock::now();
    return chrono::duration<double>(end_time - start_time).count();
}

template<typename T>
int rand(T a, T b) { return uniform_int_distribution<T>(a, b)(rng); }

template<typename T1, typename T2>
bool ckmax(T1& a, T2 b) { return a < b ? a = b, true : false; }

template<typename T1, typename T2>
bool ckmin(T1& a, T2 b) { return a > b ? a = b, true : false; }


// Idee: a = b = x, c = y
void testcase() {
    long long l, r;
    cin >> l >> r;
    long long x = l, y = r;
    for (int i = 31; i >= 0; --i) {
        if (!((x >> i) & 1) && ((y >> i) & 1)) {
            x = (((x >> i) | 1) << i) - 1;
            y = (y >> i) << i;
            break;
        }
    }
    cout << x << " " << x << " " << y << "\n";
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    int tc = 1;
    cin >> tc;
    for (int t = 1; t <= tc; ++t) {
#ifdef _DEBUG
        cerr << "=== Subtask " << t << " ===" << nl;
#endif
        testcase();
#ifdef _DEBUG
        cerr << nl;
#endif
    }
}

Submission (verdict: Wrong answer on test 1):
#include <bits/stdc++.h>
using namespace std;
const char nl = '\n';
const char sp = ' ';
const int inf = 0x3f3f3f3f;
const string OUT[2]{ "NO", "YES" };
const string out[2]{ "No", "Yes" };
#define all(a) a.begin(), a.end()
#define dbg(a) cerr << (#a) << " = " << a << nl
#define OK() cerr << "OK until line " << __LINE__ << nl
using ll = long long;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
ifstream fin(".in");
ofstream fout(".out");

auto start_time = chrono::high_resolution_clock::now();

double amcbn() {
    auto end_time = chrono::high_resolution_clock::now();
    return chrono::duration<double>(end_time - start_time).count();
}

template<typename T>
int rand(T a, T b) { return uniform_int_distribution<T>(a, b)(rng); }

template<typename T1, typename T2>
bool ckmax(T1& a, T2 b) { return a < b ? a = b, true : false; }

template<typename T1, typename T2>
bool ckmin(T1& a, T2 b) { return a > b ? a = b, true : false; }


// Idee: a = b = x, c = y
void testcase() {
    long long l, r;
    cin >> l >> r;
    long long x = l, y = r;
    int mismatch = 31;
    while (!(((x ^ y) >> mismatch) & 1)) {
        --mismatch;
    }
    x = (((x >> mismatch) | 1) << mismatch) - 1;
    y = (y >> mismatch) << mismatch;
    cout << x - 1 << " " << x << " " << y + 1 << "\n";
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    int tc = 1;
    cin >> tc;
    for (int t = 1; t <= tc; ++t) {
#ifdef _DEBUG
        cerr << "=== Subtask " << t << " ===" << nl;
#endif
        testcase();
#ifdef _DEBUG
        cerr << nl;
#endif
    }
}