From ed30499f7213c756c75527673dd9dbcc1bf059b5 Mon Sep 17 00:00:00 2001
From: omagdy7 <omar.professional8777@gmail.com>
Date: Tue, 1 Nov 2022 13:18:09 +0200
Subject: Added first 3 problem of CSES problem set

---
 cses/MissingNumber/main.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 cses/MissingNumber/main.cpp

(limited to 'cses/MissingNumber/main.cpp')

diff --git a/cses/MissingNumber/main.cpp b/cses/MissingNumber/main.cpp
new file mode 100644
index 0000000..77f0f06
--- /dev/null
+++ b/cses/MissingNumber/main.cpp
@@ -0,0 +1,19 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+
+int main () {
+	ios_base::sync_with_stdio(false);
+	cin.tie(NULL);
+  int n;
+  cin >> n;
+  long long sum = 0;
+  for (int i = 0; i < n - 1; i++) {
+    int x;
+    cin >> x;
+    sum += x;
+  }
+  long long x = n + 1;
+  long long ans = ((n * x) / 2) - sum;
+  cout << ans << endl;
+}
-- 
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