Problem p03593 (C++)

Buggy submission (status: Runtime Error):
#include <bits/stdc++.h>
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define codefor                                                                \
  int test;                                                                    \
  scanf("%d", &test);                                                          \
  while (test--)
#define INT(...)                                                               \
  int __VA_ARGS__;                                                             \
  in(__VA_ARGS__)
#define LL(...)                                                                \
  ll __VA_ARGS__;                                                              \
  in(__VA_ARGS__)
#define yes(ans)                                                               \
  if (ans)                                                                     \
    printf("yes\n");                                                           \
  else                                                                         \
    printf("no\n")
#define Yes(ans)                                                               \
  if (ans)                                                                     \
    printf("Yes\n");                                                           \
  else                                                                         \
    printf("No\n")
#define YES(ans)                                                               \
  if (ans)                                                                     \
    printf("YES\n");                                                           \
  else                                                                         \
    printf("NO\n")
#define vector1d(type, name, ...) vector<type> name(__VA_ARGS__)
#define vector2d(type, name, h, ...)                                           \
  vector<vector<type>> name(h, vector<type>(__VA_ARGS__))
#define umap unordered_map
#define uset unordered_set
using namespace std;
using ll = long long;
const int MOD = 1000000007;
// 入力系
void scan(int &a) { scanf("%d", &a); }
void scan(long long &a) { scanf("%lld", &a); }
template <class T> void scan(T &a) { cin >> a; }
template <class T> void scan(vector<T> &vec) {
  for (auto &&it : vec)
    scan(it);
}
void in() {}
template <class Head, class... Tail> void in(Head &head, Tail &...tail) {
  scan(head);
  in(tail...);
}
// 出力系
void print(const int &a) { printf("%d", a); }
void print(const long long &a) { printf("%lld", a); }
void print(const double &a) { printf("%.15lf", a); }
template <class T> void print(const T &a) { cout << a; }
template <class T> void print(const vector<T> &vec) {
  if (vec.empty())
    return;
  print(vec[0]);
  for (auto it = vec.begin(); ++it != vec.end();) {
    putchar(' ');
    print(*it);
  }
}
void out() { putchar('\n'); }
template <class T> void out(const T &t) {
  print(t);
  putchar('\n');
}
template <class Head, class... Tail>
void out(const Head &head, const Tail &...tail) {
  print(head);
  putchar(' ');
  out(tail...);
}
// デバッグ系
template <class T> void dprint(const T &a) { cerr << a; }
template <class T> void dprint(const vector<T> &vec) {
  if (vec.empty())
    return;
  cerr << vec[0];
  for (auto it = vec.begin(); ++it != vec.end();) {
    cerr << " " << *it;
  }
}
void debug() { cerr << endl; }
template <class T> void debug(const T &t) {
  dprint(t);
  cerr << endl;
}
template <class Head, class... Tail>
void debug(const Head &head, const Tail &...tail) {
  dprint(head);
  cerr << " ";
  debug(tail...);
}
ll intpow(ll a, ll b) {
  ll ans = 1;
  while (b) {
    if (b & 1)
      ans *= a;
    a *= a;
    b /= 2;
  }
  return ans;
}
ll modpow(ll a, ll b, ll p) {
  ll ans = 1;
  while (b) {
    if (b & 1)
      (ans *= a) %= p;
    (a *= a) %= p;
    b /= 2;
  }
  return ans;
}
ll updivide(ll a, ll b) {
  if (a % b == 0)
    return a / b;
  else
    return (a / b) + 1;
}

int main() {
  INT(h, w);
  vector2d(char, s, h, w);
  vector<int> table(26, 0);
  in(s);
  rep(y, h) {
    rep(x, w) { table[s[y][x] - 'a']++; }
  }
  int counter = 0, odd = 0, oddn = 0, two = 0, twon = 0, line;
  rep(i, 26) {
    counter += (table[i] % 4 == 0);
    if (table[i] % 2 == 1) {
      odd++;
    } else if (table[i] % 2 == 0 && table[i] % 4 != 0) {
      two++;
      twon += table[i];
    }
  }
  if (h % 2 == 0 && w % 2 == 0) {
    Yes(counter == 26);
  } else if (h % 2 == 1 && w % 2 == 1) {
    return 1;
  } else {
    if (h % 2 == 0)
      line = h;
    else
      line = w;
    Yes(odd == 0 && two <= line / 2);
  }
}

Fixed submission:
#include <bits/stdc++.h>
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define codefor                                                                \
  int test;                                                                    \
  scanf("%d", &test);                                                          \
  while (test--)
#define INT(...)                                                               \
  int __VA_ARGS__;                                                             \
  in(__VA_ARGS__)
#define LL(...)                                                                \
  ll __VA_ARGS__;                                                              \
  in(__VA_ARGS__)
#define yes(ans)                                                               \
  if (ans)                                                                     \
    printf("yes\n");                                                           \
  else                                                                         \
    printf("no\n")
#define Yes(ans)                                                               \
  if (ans)                                                                     \
    printf("Yes\n");                                                           \
  else                                                                         \
    printf("No\n")
#define YES(ans)                                                               \
  if (ans)                                                                     \
    printf("YES\n");                                                           \
  else                                                                         \
    printf("NO\n")
#define vector1d(type, name, ...) vector<type> name(__VA_ARGS__)
#define vector2d(type, name, h, ...)                                           \
  vector<vector<type>> name(h, vector<type>(__VA_ARGS__))
#define umap unordered_map
#define uset unordered_set
using namespace std;
using ll = long long;
const int MOD = 1000000007;
// 入力系
void scan(int &a) { scanf("%d", &a); }
void scan(long long &a) { scanf("%lld", &a); }
template <class T> void scan(T &a) { cin >> a; }
template <class T> void scan(vector<T> &vec) {
  for (auto &&it : vec)
    scan(it);
}
void in() {}
template <class Head, class... Tail> void in(Head &head, Tail &...tail) {
  scan(head);
  in(tail...);
}
// 出力系
void print(const int &a) { printf("%d", a); }
void print(const long long &a) { printf("%lld", a); }
void print(const double &a) { printf("%.15lf", a); }
template <class T> void print(const T &a) { cout << a; }
template <class T> void print(const vector<T> &vec) {
  if (vec.empty())
    return;
  print(vec[0]);
  for (auto it = vec.begin(); ++it != vec.end();) {
    putchar(' ');
    print(*it);
  }
}
void out() { putchar('\n'); }
template <class T> void out(const T &t) {
  print(t);
  putchar('\n');
}
template <class Head, class... Tail>
void out(const Head &head, const Tail &...tail) {
  print(head);
  putchar(' ');
  out(tail...);
}
// デバッグ系
template <class T> void dprint(const T &a) { cerr << a; }
template <class T> void dprint(const vector<T> &vec) {
  if (vec.empty())
    return;
  cerr << vec[0];
  for (auto it = vec.begin(); ++it != vec.end();) {
    cerr << " " << *it;
  }
}
void debug() { cerr << endl; }
template <class T> void debug(const T &t) {
  dprint(t);
  cerr << endl;
}
template <class Head, class... Tail>
void debug(const Head &head, const Tail &...tail) {
  dprint(head);
  cerr << " ";
  debug(tail...);
}
ll intpow(ll a, ll b) {
  ll ans = 1;
  while (b) {
    if (b & 1)
      ans *= a;
    a *= a;
    b /= 2;
  }
  return ans;
}
ll modpow(ll a, ll b, ll p) {
  ll ans = 1;
  while (b) {
    if (b & 1)
      (ans *= a) %= p;
    (a *= a) %= p;
    b /= 2;
  }
  return ans;
}
ll updivide(ll a, ll b) {
  if (a % b == 0)
    return a / b;
  else
    return (a / b) + 1;
}

int main() {
  INT(h, w);
  vector2d(char, s, h, w);
  vector<int> table(26, 0);
  in(s);
  rep(y, h) {
    rep(x, w) { table[s[y][x] - 'a']++; }
  }
  int counter = 0, odd = 0, oddn = 0, two = 0, twon = 0, line;
  rep(i, 26) {
    counter += (table[i] % 4 == 0);
    if (table[i] % 2 == 1) {
      odd++;
    } else if (table[i] % 2 == 0 && table[i] % 4 != 0) {
      two++;
      twon += table[i];
    }
  }
  if (h % 2 == 0 && w % 2 == 0) {
    Yes(counter == 26);
  } else if (h % 2 == 1 && w % 2 == 1) {
    Yes(odd == 1 && two <= (h + w - 2) / 2);
  } else {
    if (h % 2 == 0)
      line = h;
    else
      line = w;
    Yes(odd == 0 && two <= line / 2);
  }
}