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OI-codes/Codeforces/1681/C/C.cpp

70 lines
1.4 KiB
C++

#include <iostream>
#include <algorithm>
#include <vector>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 105;
int t, n, a[N], b[N];
std::pair<int, int> c[N];
std::vector<std::pair<int, int>> nums, ans;
int main() {
std::ios::sync_with_stdio(false);
cin >> t;
while (t--) {
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a[i];
}
for (int i = 1; i <= n; i++) {
cin >> b[i];
}
for (int i = 1; i <= n; i++) {
nums.push_back(std::make_pair(a[i], b[i]));
c[i] = std::make_pair(a[i], b[i]);
}
std::sort(nums.begin(), nums.end());
bool flag = true;
for (int i = 1; i < nums.size(); i++) {
if (nums[i - 1].second > nums[i].second) {
cout << -1 << endl;
flag = false;
break;
}
}
if (flag) {
for (int i = 1; i < n; i++) {
for (int j = i + 1; j <= n; j++) {
if (c[i] > c[j]) {
ans.push_back(std::make_pair(i, j));
std::swap(c[i], c[j]);
}
}
}
cout << ans.size() << endl;
for (auto e : ans) {
cout << e.first << ' ' << e.second << endl;
}
}
nums.clear();
ans.clear();
}
return 0;
}