From fa0a2c8f3392ca90ee4d2a2599000793607d0c7e Mon Sep 17 00:00:00 2001
From: Ren Baoshuo <i@baoshuo.ren>
Date: Sat, 30 Oct 2021 22:39:29 +0800
Subject: [PATCH] A - Era

https://codeforces.com/contest/1604/submission/133618725
---
 CodeForces/1604/A/A.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 CodeForces/1604/A/A.cpp

diff --git a/CodeForces/1604/A/A.cpp b/CodeForces/1604/A/A.cpp
new file mode 100644
index 00000000..4e98ea87
--- /dev/null
+++ b/CodeForces/1604/A/A.cpp
@@ -0,0 +1,19 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int t, n, a, ans;
+
+int main() {
+    cin >> t;
+    while (t--) {
+        ans = 0;
+        cin >> n;
+        for (int i = 1; i <= n; i++) {
+            cin >> a;
+            ans = max(ans, a - i);
+        }
+        cout << ans << endl;
+    }
+    return 0;
+}