1 files changed, 26 insertions, 0 deletions
diff --git a/codeforces/yapapsai/main.cpp b/codeforces/yapapsai/main.cpp
new file mode 100644
index 0000000..2946e65
--- /dev/null
+++ b/codeforces/yapapsai/main.cpp
@@ -0,0 +1,26 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+
+int main () {
+	ios_base::sync_with_stdio(false);
+	cin.tie(NULL);
+	int tt;
+	cin >> tt;
+	while(tt--){
+    int n;
+    cin >> n;
+    vector<int> pos;
+    long long ans = 0;
+    for (int i = 1; i <= n; i++) {
+      int x;
+      cin >> x;
+      if (x < i) {
+        auto it = lower_bound(pos.begin(), pos.end(), x);
+        ans += it - pos.begin();
+        pos.emplace_back(i);
+      }
+    }
+    cout << ans << '\n';
+	}
+}