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AtCoder/abc390/B_Geometric_Sequence.cpp

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+#include <bits/stdc++.h>
+#define lo long long
+#define INF INT_MAX
+#define LLM LONG_LONG_MAX
+
+using namespace std;
+const lo N = 1e7 + 10;
+/*
+    toothless. #17
+    @fredcss_dev
+*/
+
+lo n;
+lo a[N], b;
+bool flag = 0;
+
+signed main()
+{
+    cin >> n;
+    for (int i = 1; i <= n; i++) {
+        cin >> a[i];
+    }
+    for (int i = 3; i <= n; i++)
+    {
+        if (a[i] * a[1] != a[i - 1] * a[2])
+        {
+            puts("No");
+            return 0;
+        }
+    }
+    puts("Yes");
+    return 0;
+}