Submission #3435455

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Source Code Expand

#include <bits/stdc++.h>

#define forn(i, n) for (int i = 0; i < (int)n; ++i)
#define for1(i, n) for (int i = 1; i <= (int)n; ++i)
#define fore(i, l, r) for (int i = (int)(l); i <= (int)(r); ++i)
#define ford(i, n) for (int i = (int)(n) - 1; i >= 0; --i)
#define pb push_back
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()

using namespace std;

typedef long long i64;
typedef vector<int> vi;
typedef vector<i64> vi64;
typedef vector<vi> vvi;
typedef vector<vi64> vvi64;
typedef double ld;

int main() {
    
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.precision(10);
    cout << fixed;

    int N;
    string s;
    cin >> N >> s;

    vi vs(N, 0);
    forn(i, N) {
        if (s[i] == 'x') vs[i] = 1;
    }
    vi _vs(N, 0);
    string ans(N, 'S');

    forn(i, N) {
        if (vs[i] != _vs[i]) {
            ans[(i + 1) % N] = 'W';
            fore(j, i, i + 2) {
                _vs[j % N] ^= 1;
            }
        }
    }

    bool isans = true;
    forn(i, N) {
        if (vs[i] != _vs[i]) {
            isans = false;
            break;
        }
    }

    if (isans) {
        cout << ans << endl;
        return 0;
    }


    _vs = vi(N, 0);
    ans = string(N, 'S');

    fore(i, 1, N) {
        if (vs[i] != _vs[i]) {
            ans[(i + 1) % N] = 'W';
            fore(j, i, i + 2) {
                _vs[j % N] ^= 1;
            }
        }
    }

    isans = true;
    forn(i, N) {
        if (vs[i] != _vs[i]) {
            isans = false;
            break;
        }
    }

    if (isans) {
        cout << ans << endl;
        return 0;
    }

    _vs = vi(N, 0);
    ans = string(N, 'S');

    fore(i, 2, N + 1) {
        if (vs[i] != _vs[i]) {
            ans[(i + 1) % N] = 'W';
            fore(j, i, i + 2) {
                _vs[j % N] ^= 1;
            }
        }
    }

    isans = true;
    forn(i, N) {
        if (vs[i] != _vs[i]) {
            isans = false;
            break;
        }
    }

    if (isans) {
        cout << ans << endl;
        return 0;
    }

    // for (auto c: vs) cout << c; cout << endl;
    // for (auto c: _vs) cout << c; cout << endl;

    cout << -1 << endl;
    return 0;
}

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