Problem p02711 (C++)

Buggy submission (status: Time Limit Exceeded):
#include <algorithm>
#include <bitset>
#include <cassert>
#include <chrono>
#include <cmath>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <istream>
#include <map>
#include <ostream>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <time.h>
#include <unordered_map>
#include <unordered_set>
#include <vector>

using namespace std;

#define int long long
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define pii pair<int, int>
#define ld long double

ostream &operator<<(ostream &a, const vector<int> &b) {
  for (auto k : b)
    cout << k << " ";
  return a;
}

#ifdef LOCAL
#define dbg(x) cout << #x << " : " << (x) << "\n";
const int INF = 1e18;
//    const int mod = 2600000069;
//    const int p = 10;
//    const ld PI = 3.1415926535;
#else
#define dbg(x)
const int INF = 1e18;
//    const int mod = 2600000069;
//    const int p = 179;
//    const ld PI = 3.1415926535;
#endif

// #pragma GCC optimize("Ofast,no-stack-protector")
// #pragma GCC target("sse,sse2,sse3,sse3,sse4")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC optimize("fast-math")
// #pragma GCC target("avx2")
// #pragma GCC optimize("section-anchors")
// #pragma GCC optimize("profile-values,profile-reorder-functions,tracer")
// #pragma GCC optimize("vpt")
// #pragma GCC optimize("rename-registers")
// #pragma GCC optimize("move-loop-invariants")
// #pragma GCC optimize("unswitch-loops")
// #pragma GCC optimize("function-sections")
// #pragma GCC optimize("data-sections")

signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int n;
  cin >> n;
  while (n) {
    if (n % 10 == 7) {
      cout << "Yes\n";
      return 0;
    }
  }
  cout << "No\n";

//----------------------------------------------------------------------
#ifdef LOCAL
  cerr << "Time elapsed: " << (double)clock() / CLOCKS_PER_SEC << "s.\n";
#endif
}
/*

*/


Fixed submission:
#include <algorithm>
#include <bitset>
#include <cassert>
#include <chrono>
#include <cmath>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <istream>
#include <map>
#include <ostream>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <time.h>
#include <unordered_map>
#include <unordered_set>
#include <vector>

using namespace std;

#define int long long
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define pii pair<int, int>
#define ld long double

ostream &operator<<(ostream &a, const vector<int> &b) {
  for (auto k : b)
    cout << k << " ";
  return a;
}

#ifdef LOCAL
#define dbg(x) cout << #x << " : " << (x) << "\n";
const int INF = 1e18;
//    const int mod = 2600000069;
//    const int p = 10;
//    const ld PI = 3.1415926535;
#else
#define dbg(x)
const int INF = 1e18;
//    const int mod = 2600000069;
//    const int p = 179;
//    const ld PI = 3.1415926535;
#endif

// #pragma GCC optimize("Ofast,no-stack-protector")
// #pragma GCC target("sse,sse2,sse3,sse3,sse4")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC optimize("fast-math")
// #pragma GCC target("avx2")
// #pragma GCC optimize("section-anchors")
// #pragma GCC optimize("profile-values,profile-reorder-functions,tracer")
// #pragma GCC optimize("vpt")
// #pragma GCC optimize("rename-registers")
// #pragma GCC optimize("move-loop-invariants")
// #pragma GCC optimize("unswitch-loops")
// #pragma GCC optimize("function-sections")
// #pragma GCC optimize("data-sections")

signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int n;
  cin >> n;
  while (n) {
    if (n % 10 == 7) {
      cout << "Yes\n";
      return 0;
    }
    n /= 10;
  }
  cout << "No\n";

//----------------------------------------------------------------------
#ifdef LOCAL
  cerr << "Time elapsed: " << (double)clock() / CLOCKS_PER_SEC << "s.\n";
#endif
}
/*

*/