Graph, Number Theory, String Hashing Algo added

Number Theory/inverse_modulo_array.cpp

@@ -0,0 +1,24 @@
+vector<int> invs( vi& a , int m ){
+	int n = (int)a.size();
+	
+	if( n == 0 ) return {};
+	
+	vector<int> b(n);
+	
+	int v = 1;
+	for(int i = 0 ; i < n ; i++ ){
+		b[i] = v;
+		v = ((long long)v * a[i] ) % m; 
+	}
+	
+	int x = power( v , m - 2 , m ) ;
+	
+	x = (x % m + m ) % m;
+	
+	for(int i = n - 1 ; i >= 0 ; i-- ){
+		b[i] = x * b[i] %m;
+		x = x * a[i] % m;
+	}
+	
+	return b;
+}