Create 1969.Minimum-Non-Zero-Product-of-the-Array-Elements.cpp

cc98mengxinghun · Aug 15, 2021 · c3ad25d · c3ad25d
1 parent 2302b95
commit c3ad25d
Showing 1 changed file with 20 additions and 0 deletions.
diff --git a/...ero-Product-of-the-Array-Elements/1969.Minimum-Non-Zero-Product-of-the-Array-Elements.cpp b/...ero-Product-of-the-Array-Elements/1969.Minimum-Non-Zero-Product-of-the-Array-Elements.cpp
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+using LL = long long;
+class Solution {
+    LL M = 1e9+7;
+public:    
+    LL quickMul(LL x, LL N) 
+    {
+        if (N == 0) return 1;
+        LL y = quickMul(x, N / 2);
+        return N % 2 == 0 ? (y * y % M) : (y * y % M * x % M);
+    }    
+
+    int minNonZeroProduct(int p) 
+    {
+        LL a = (1ll<<(p-1)) - 1;
+        LL x = ((1ll<<p)-1) % M;        
+        LL ret = quickMul(x-1, a) * x % M;
+
+        return ret;
+    }
+};