diff options
| -rw-r--r-- | Math/numtheory.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Math/numtheory.cpp b/Math/numtheory.cpp index 02228e2..a2be7db 100644 --- a/Math/numtheory.cpp +++ b/Math/numtheory.cpp @@ -1,5 +1,6 @@ constexpr ll MOD = 1e9+7; + inline ll pw(ll base, ll exp) { ll res = 1; while (exp) { @@ -15,4 +16,5 @@ ll fact[MN] = { 1 }, ifact[MN] = { 1 }; inline ll nCr(int n, int k) { return fact[n]*ifact[k]%MOD*ifact[n-k]%MOD; } + for (int i = 0; i < N; ++i) fact[i+1] = (i+1ll)*fact[i]%MOD, ifact[i+1] = inv(fact[i+1]); |