Frederick Chen
ee1f0db08b
https://atcoder.jp/contests/abc390 Signed-off-by: Frederick Chen <seventeen@ohdragonboi.cn>
33 lines
493 B
C++
33 lines
493 B
C++
#include <bits/stdc++.h>
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#define lo long long
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#define INF INT_MAX
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#define LLM LONG_LONG_MAX
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using namespace std;
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const lo N = 1e7 + 10;
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/*
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toothless. #17
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@fredcss_dev
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*/
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lo n;
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lo a[N], b;
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bool flag = 0;
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signed main()
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{
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cin >> n;
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for (int i = 1; i <= n; i++) {
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cin >> a[i];
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}
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for (int i = 3; i <= n; i++)
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{
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if (a[i] * a[1] != a[i - 1] * a[2])
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{
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puts("No");
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return 0;
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}
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}
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puts("Yes");
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return 0;
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} |