atcoder.jp A - Seats #.# の数を数える 提出コード void solve() { int N; string S; cin >> N >> S; int ans = 0; REP(i, 1, N - 1) { if (S[i - 1] == '#' and S[i] == '.' and S[i + 1] == '#') ans++; } cout << ans << endl; } B - Traveling Takahash…