- #include <iostream>
- #include <queue>
- using namespace std;
- const int maxl = 2000000000;
- class Map {
- struct item {
- string key; int value;
- } d[maxl];
- int cnt;
- public:
- int find(string x) {
- for (int i = 0; i < cnt; i++)
- if (d[i].key == x)
- return d[i].value;
- return -1;
- }
- static int end() { return -1; }
- void insert(string k, int v) {
- d[cnt].key = k; d[cnt++].value = v;
- }
- } s[2];
- class Queue {
- string q[maxl];
- int head, tail;
- public:
- void pop() { ++head; }
- string front() { return q[head + 1]; }
- bool empty() { return head == tail; }
- void push(string x) { q[++tail] = x; }
- } q[2];
- string st0, st1;
- int m;
- string LtoR(string s, int L, int R) {
- string t = s;
- char tmp = t[L];
- for (int i = L; i < R; ++i)
- t[i] = t[i + 1];
- t[R] = tmp;
- return t;
- }
- string RtoL(string s, int L, int R) {
- string t = s;
- char tmp = t[R];
- for (int i = R; i > L; --i)
- t[i] = t[i - 1];
- t[L] = tmp;
- return t;
- }
- bool check(string st, int p, int step) {
- if (s[p].find(st) != s[p].end())
- return false;
- ++step;
- if (s[p ^ 1].find(st) == s[p].end()) {
- s[p].insert(st, step);
- q[p].push(st);
- return false;
- }
- cout << s[p ^ 1].find(st) + step << endl;
- return true;
- }
- int main() {
- cin >> st0 >> st1;
- int len = st0.length();
- if (len != st1.length()) {
- cout << -1 << endl;
- return 0;
- }
- if (st0 == st1) {
- cout << 0 << endl;
- return 0;
- }
- cin >> m;
- s[0].insert(st0, 0); s[1].insert(st1, 0);
- q[0].push(st0); q[1].push(st1);
- for (int p = 0;
- !(q[0].empty() && q[1].empty());
- p ^= 1) {
- string st = q[p].front(); q[p].pop();
- int step = s[p].find(st);
- if ((p == 0 &&
- (check(LtoR(st, m, len - 1), p, step) ||
- check(RtoL(st, 0, m), p, step)))
- ||
- (p == 1 &&
- (check(LtoR(st, 0, m), p, step) ||
- check(RtoL(st, m, len - 1), p, step))))
- return 0;
- }
- cout << -1 << endl;
- return 0;
- }
4)若输入的第一个字符串长度由 100 个不同的字符构成,第二个字符串是第一个字符串的倒序,输入的 m 为 0,则输出为( )。