Some Changes

Number Theory/Fast_Multiply.cpp

@@ -1,9 +1,19 @@
-int fast_multiply(int a,int b,int c){
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int binary_multiplication(int a , int b,int M=(int)1e9+7){
     int res = 0;
     while( b ){
-		if(b&1)res+=a,res%=c;
+        if( b&1 ) res += a , res %= M;
-		a+=a,a%=c;
+        a = 2 * a ; a %= M:
         b >>= 1;
     }
+
     return res;
 }
+
+int main(){
+
+    return 0;
+}