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#912. [2018.8雅礼集训8.9]Hunter

https://sjzezoj.com/submission/59289
This commit is contained in:
Baoshuo Ren 2022-10-03 17:13:45 +08:00
parent b836ec30ab
commit 697d8f7487
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
44 changed files with 174 additions and 0 deletions

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#include <iostream>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 1e5 + 5;
const int mod = 998244353;
int n, w[N], ans = 1;
int binpow(int a, int b, int m) {
int res = 1;
a %= m;
while (b) {
if (b & 1) res = static_cast<long long>(res) * a % m;
a = static_cast<long long>(a) * a % m;
b >>= 1;
}
return res;
}
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> w[i];
}
for (int i = 2; i <= n; i++) {
ans = (static_cast<long long>(ans)
+ static_cast<long long>(w[i]) * binpow(w[i] + w[1], mod - 2, mod) % mod)
% mod;
}
cout << ans << endl;
return 0;
}

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