C - Double Sort

https://codeforces.com/contest/1681/submission/158201208

Codeforces/1681/C/C.cpp

@@ -0,0 +1,69 @@
+#include <algorithm>
+#include <iostream>
+#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;
+}