Submission #1632634

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Source Code Expand

// clang-format off
#include <bits/stdc++.h>
#define int long long
#define main signed main()
#define loop(i, a, n) for (int i = (a); i < (n); i++)
#define rep(i, n) loop(i, 0, n)
#define forever for (;;)
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()
#define prec(n) fixed << setprecision(n)
template<typename A> using V = std::vector<A>;
template<typename A> using F = std::function<A>;
template<typename A, typename B> using P = std::pair<A, B>;
using pii = P<int, int>;
using vi = V<int>;
using vd = V<double>;
using vs = V<std::string>;
using vpii = V<pii>;
using vvi = V<vi>;
using vvpii = V<vpii>;
constexpr int INF = sizeof(int) == sizeof(long long) ? 1000000000000000000LL : 1000000000;
constexpr int MOD = 1000000007;
constexpr double PI = 3.14159265358979;
template<typename A, typename B> bool cmin(A &a, const B &b) { return a > b ? (a = b, true) : false; }
template<typename A, typename B> bool cmax(A &a, const B &b) { return a < b ? (a = b, true) : false; }
constexpr bool odd(const int n) { return n & 1; }
constexpr bool even(const int n) { return ~n & 1; }
template<typename T> std::istream &operator>>(std::istream &is, std::vector<T> &v) { for (T &x : v) is >> x; return is; }
template<typename A, typename B> std::istream &operator>>(std::istream &is, std::pair<A, B> &p) { is >> p.first; is >> p.second; return is; }
using namespace std;
// clang-format on

main {
  int n;
  string s;
  cin >> n >> s;
  rep(i, 4) {
    string t;
    t += string(i & 1 ? "W" : "S") + string(i >> 1 & 1 ? "W" : "S");
    rep(j, n - 2) {
      if (t[j + 1] == 'S') t += (s[j + 1] == 'o') ? t[j] : 'S' + 'W' - t[j];
      if (t[j + 1] == 'W') t += (s[j + 1] == 'o') ? 'S' + 'W' - t[j] : t[j];
    }
    bool valid = true;
    valid &= ((s[0] == 'o') == (t[0] == 'S')) == (t[1] == t[n - 1]);
    valid &= ((s[n - 1] == 'o') == (t[n - 1] == 'S')) == (t[0] == t[n - 2]);
    if (valid) {
      cout << t << endl;
      return 0;
    }
  }
  cout << -1 << endl;
}

Submission Info

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