Submission #1115942

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Source Code Expand

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <climits>
#include <vector>
#include <string>
#include <queue>
#include <deque>
#include <list>
#include <stack>
#include <set>
#include <map>
#include <algorithm>

#define int long long
#define MOD7 1000000007
#define MOD9 1000000009

#define rep(i, n) for (int i = 0; i < (n); i++)
#define REP(i, a, n) for (int i = (a); i <= (n); i++)
#define all(a) (a).begin(), (a).end()

using namespace std;

int dx[4] = { 1, 0, -1, 0 };
int dy[4] = { 0, -1, 0, 1 };

int nextInt() {int a; cin >> a; return a;}
char nextChar() {char a; cin >> a; return a;}
double nextDouble() {double a; cin >> a; return a;}
string nextString() {string a; cin >> a; return a;}

template<class T> void inputVector(vector<T>& v, int n) {
    v.resize(n);
    for (int i = 0; i < v.size(); i++) cin >> v[i];
}

char f(char a, char b, char c) {
	if (b == 'S') {
		if (c == 'o') return a;
		if (a == 'W') return 'S';
		return 'W';
	}
	if (c == 'x') return a;
	if (a == 'W') return 'S';
	return 'W';
}

int n;
string s;

bool ok(string ret) {
	char a = ret[n - 2];
	char b = ret[n - 1];
	char c = ret[0];
	char d = ret[1];
	if (f(a, b, s[n - 1]) != c) return false;
	if (f(b, c, s[0]) != d) return false;
	return true;
}

signed main() {
	cin >> n;
	cin >> s;

	string ret = "";
	ret += "SS";
	REP(i, 1, n - 2) {
		ret.push_back(f(ret[i - 1], ret[i], s[i]));
	}
	if (ok(ret)) {
		cout << ret << endl;;
		return 0;
	}

	ret = "";
	ret += "SW";
	REP(i, 1, n - 2) {
		ret.push_back(f(ret[i - 1], ret[i], s[i]));
	}
	if (ok(ret)) {
		cout << ret << endl;;
		return 0;
	}

	ret = "";
	ret += "WS";
	REP(i, 1, n - 2) {
		ret.push_back(f(ret[i - 1], ret[i], s[i]));
	}
	if (ok(ret)) {
		cout << ret << endl;;
		return 0;
	}

	ret = "";
	ret += "WW";
	REP(i, 1, n - 2) {
		ret.push_back(f(ret[i - 1], ret[i], s[i]));
	}
	if (ok(ret)) {
		cout << ret << endl;;
		return 0;
	}

	cout << -1 << endl;

    return 0;
}

Submission Info

Judge Result