#include <bits/stdc++.h>
using namespace std;
#define ll long long
vector<array<int, 2>> v;
set<vector<array<int, 2>>> vis;
int cur = 0, mn = 1e9;
int n, m;
pair<int, vector<array<int, 2>>> solve() {
queue<pair<pair<int, vector<array<int, 2>>>, vector<array<int, 2>>>> q;
q.push({{0, {}}, v});
while (q.size()) {
int c = q.front().first.first;
vector<array<int, 2>> ops = q.front().first.second;
vector<array<int, 2>> v = q.front().second;
bool gud = 1;
for (auto [b, t] : v) {
gud &= b == t;
}
if (gud) {
return {c, ops};
}
for (int i = 0; i < m; i++) {
for (int j = 0; j < m; j++) {
if (i == j) continue;
if (!v[i][0] || v[j][1] || (v[i][0] && v[i][0] == v[i][1]) || (v[j][0] && v[j][0] == v[j][1])) continue;
int x = 1, y = 0;
if (!v[i][x]) x = 0;
if (v[j][y]) y = 1;
if (y == 0 || v[i][x] == v[j][0]) {
swap(v[i][x], v[j][y]);
cur++;
ops.push_back({i + 1, j + 1});
if (vis.find(v) == vis.end()) {
vis.insert(v);
q.push({{c + 1, ops}, v});
}
ops.pop_back();
cur--;
swap(v[i][x], v[j][y]);
}
}
}
}
return {1e9, {}};
}
int main() {
ios_base::sync_with_stdio(0), cin.tie(0);
cin >> n >> m;
v.resize(m);
for (int i = 0; i < m; i++) {
cin >> v[i][0] >> v[i][1];
}
pair<int, vector<array<int, 2>>> ans = solve();
if (ans.first == (int)1e9) {
cout << "-1\n";
} else {
vector<array<int, 2>> ops = ans.second;
cout << ops.size() << '\n';
for (auto [x, y] : ops) {
cout << x << ' ' << y << '\n';
}
}
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Execution timed out |
2061 ms |
348 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
281 ms |
524288 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Execution timed out |
2004 ms |
13396 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Execution timed out |
2004 ms |
13396 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Execution timed out |
2063 ms |
151504 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Execution timed out |
2061 ms |
348 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |