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C++::algorithms::Fast_Exponentiation
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| ll fast_expo(ll base, ll expt) { | |
| if (expt == 0) return 1LL; | |
| if (expt == 1) return base; | |
| ll ans = fast_expo(base, expt / 2); | |
| ans = (ans + MOD) % MOD; | |
| ans = (ans * ans + MOD) % MOD; | |
| if (expt & 1LL) ans = (ans * base + MOD) % MOD; | |
| return ans; | |
| } |
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