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90. 64位整数乘法

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https://www.acwing.com/problem/content/submission/code_detail/7861200/
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Baoshuo Ren 2021-09-22 21:31:40 +08:00 committed by Baoshuo Ren
parent 764424125c
commit a1f6e8959c
Signed by: baoshuo
GPG Key ID: 70F90A673FB1AB68
1 changed files with 21 additions and 0 deletions
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AcWing/90/90.cpp Normal file
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#include <bits/stdc++.h>
using namespace std;
long long bintimes(long long a, long long b, long long m) {
a %= m;
long long res = 0;
while (b > 0) {
if (b & 1) res = (res + a) % m;
a = (a + a) % m;
b >>= 1;
}
return res;
}
int main() {
long long a, b, p;
cin >> a >> b >> p;
cout << bintimes(a, b, p) << endl;
return 0;
}