Problem p02753 (C++)

Buggy submission (status: Runtime Error):
#include <bits/stdc++.h>
using namespace std;

typedef long long int ll;
typedef long double ld;

#define rep(i, n) for (ll i = 0; i < (n); ++i)
#define rep1(i, n) for (ll i = 1; i <= (n); ++i)
#define repA(i, a, n) for (ll i = a; i <= (n); ++i)
#define repD(i, a, n) for (ll i = a; i >= (n); --i)
// #define trav(a, x) for(auto& a : x)
#define all(x) x.begin(), x.end()
#define sz(x) (ll)(x).size()
#define bpc(a) __builtin_popcount(a)
#define ff first
#define ss second
#define mk0(a) memset(a, 0, sizeof(a))
#define mk_1(a) memset(a, -1, sizeof(a))

const ll MAX = 1e5 + 5;
const ll MAX1 = 1e2 + 5;
const ll INF = 1e15 + 2;
const ll MOD = 1e9 + 7;

#define pb push_back
#define faster                                                                 \
  ios_base::sync_with_stdio(false);                                            \
  cin.tie(NULL);                                                               \
  cout.tie(0);
#define pi pair<ll, ll>
#define map1 unordered_map

inline ll nc() {
  static char buf[100000], *p1 = buf, *p2 = buf;
  return p1 == p2 && (p2 = (p1 = buf) + fread(buf, 1, 100000, stdin), p1 == p2)
             ? EOF
             : *p1++;
}

inline ll read() {
  ll ret = 0;
  bool f = 0;
  char ch = nc();
  while (ch > '9' || ch < '0')
    f ^= ch == '-', ch = nc();
  while (ch <= '9' && ch >= '0')
    ret = ret * 10 + ch - '0', ch = nc();
  return f ? -ret : ret;
}

ll power(ll base, ll ind, ll mod) {
  ll res = 1;
  while (ind) {
    if (ind & 1)
      res = (res * base) % mod;
    base = (base * base) % mod;
    ind >>= 1;
  }
  return res;
}

ll inv(ll den, ll mod) { return power(den, mod - 2, mod); }

int main() {
  faster;
#ifndef ONLINE_JUDGE
  freopen("in.txt", "r", stdin);
  freopen("out.txt", "w", stdout);
#endif
  string s;
  cin >> s;
  ll c[2];
  mk0(c);
  for (int i = 0; i < sz(s); ++i) {
    if (s[i] == 'A')
      c[0]++;
    else if (s[i] == 'B')
      c[1]++;
  }
  if (c[0] == 0 or c[1] == 0)
    cout << "No\n";
  else
    cout << "Yes\n";
}

Fixed submission:
#include <bits/stdc++.h>
using namespace std;

typedef long long int ll;
typedef long double ld;

#define rep(i, n) for (ll i = 0; i < (n); ++i)
#define rep1(i, n) for (ll i = 1; i <= (n); ++i)
#define repA(i, a, n) for (ll i = a; i <= (n); ++i)
#define repD(i, a, n) for (ll i = a; i >= (n); --i)
// #define trav(a, x) for(auto& a : x)
#define all(x) x.begin(), x.end()
#define sz(x) (ll)(x).size()
#define bpc(a) __builtin_popcount(a)
#define ff first
#define ss second
#define mk0(a) memset(a, 0, sizeof(a))
#define mk_1(a) memset(a, -1, sizeof(a))

const ll MAX = 1e5 + 5;
const ll MAX1 = 1e2 + 5;
const ll INF = 1e15 + 2;
const ll MOD = 1e9 + 7;

#define pb push_back
#define faster                                                                 \
  ios_base::sync_with_stdio(false);                                            \
  cin.tie(NULL);                                                               \
  cout.tie(0);
#define pi pair<ll, ll>
#define map1 unordered_map

inline ll nc() {
  static char buf[100000], *p1 = buf, *p2 = buf;
  return p1 == p2 && (p2 = (p1 = buf) + fread(buf, 1, 100000, stdin), p1 == p2)
             ? EOF
             : *p1++;
}

inline ll read() {
  ll ret = 0;
  bool f = 0;
  char ch = nc();
  while (ch > '9' || ch < '0')
    f ^= ch == '-', ch = nc();
  while (ch <= '9' && ch >= '0')
    ret = ret * 10 + ch - '0', ch = nc();
  return f ? -ret : ret;
}

ll power(ll base, ll ind, ll mod) {
  ll res = 1;
  while (ind) {
    if (ind & 1)
      res = (res * base) % mod;
    base = (base * base) % mod;
    ind >>= 1;
  }
  return res;
}

ll inv(ll den, ll mod) { return power(den, mod - 2, mod); }

int main() {
  faster;
  /*#ifndef ONLINE_JUDGE
  freopen("in.txt","r",stdin);
  freopen("out.txt","w",stdout);
  #endif*/
  string s;
  cin >> s;
  ll c[2];
  mk0(c);
  for (int i = 0; i < sz(s); ++i) {
    if (s[i] == 'A')
      c[0]++;
    else if (s[i] == 'B')
      c[1]++;
  }
  if (c[0] == 0 or c[1] == 0)
    cout << "No\n";
  else
    cout << "Yes\n";
}