提出 #49802272

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ソースコード 拡げる

#include <bits/stdc++.h>
using namespace std;
template <typename T> inline void O(const T &x) { cout << x << '\n'; }
template <typename T, typename... W> inline void O(const T &x, const W &...b) {
  cout << x << ' ';
  O(b...);
}
template <typename T> inline void rd(T &x) { cin >> x; }
template <typename T, typename... W> inline void rd(T &x, W &...b) {
  cin >> x;
  rd(b...);
}
#ifndef MISAKA
#define err(...)
#else
#define err(...) fprintf(stderr, __VA_ARGS__)
#endif
typedef long long i64;
typedef unsigned long long u64;
typedef unsigned u32;
typedef long double dbl;
typedef pair<int, int> pii;
typedef uniform_int_distribution<int> r32;
typedef uniform_int_distribution<i64> r64;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
template <typename T> inline void ckmin(T &a, const T &b) { a = min(a, b); }
template <typename T> inline void ckmax(T &a, const T &b) { a = max(a, b); }
//#define IOFILE "filename"
//#define MULTI
const int N = 0;

inline int sol() {
  int n;
  string S, T;
  rd(n, S, T);
  for (int i = 0; i < n; ++i) {
    if (T[i] == 'A') break;
    if (S[i] != 'B') return -1;
  }
  for (int i = n - 1; i >= 0; --i) {
    if (T[i] == 'B') break;
    if (S[i] != 'A') return -1;
  }
  int x = 0, y = 0, z = 0;
  for (int i = 0; i < n; ++i) {
    if (S[i] != T[i]) {
      ++x;
      if (T[i] == 'A') ++y;
      else if (y) {
        --y;
        ++z;
      }
    }
  }
  return x - z;
}

int main() {
#ifndef MISAKA
#ifdef IOFILE
  freopen(IOFILE ".in", "r", stdin);
  freopen(IOFILE ".out", "w", stdout);
#endif
  ios::sync_with_stdio(0);
  cin.tie(0);
#endif
#ifdef MULTI
  int T;
  cin >> T;
  while (T--)
#endif
    O(sol());
  return 0;
}

提出情報

ジャッジ結果