Merge pull request #5 from LogSingleDog/master

update hash

1-字符串.md

@@ -132,6 +132,49 @@ ull get(int l, int r)
     return (Hash[r] - (Hash[l - 1] * base[r - l + 1]) % mod + mod) % mod;
 }
 ```
+### Our Hash
+```cpp
+    const int N = 1050000;
+    array<int,2> mod = {1572869,6291469};
+    array<int,2> bas = {131,137};
+    array<int,2> base[N];
+    string a;
+    int lena;
+    array<int,2> hasha[N];
+void init(){
+    ll tmp1;
+    base[0] = {1,1};
+    for(int i=1;i<=N*2-2;i++){
+        for(int j=0;j<2;j++){
+            tmp1 =  1ll*base[i-1][j]*bas[j];tmp1%=mod[j];
+            base[i][j] = tmp1%mod[j];
+        }
+    }
+}
+void geta(){
+    hasha[0] = {0,0};
+    ll tmp1;
+    for(int i=1;i<=2*lena;i++){
+        for(int j=0;j<2;j++){
+            tmp1 = 1ll*hasha[i-1][j]*base[1][j];
+            tmp1%=mod[j];
+            hasha[i][j] = tmp1+a[i] - 'A';
+            hasha[i][j]%=mod[j];
+        }
+    }
+}
+array<int,2> cala(int l){
+    array<int,2> res={0,0};
+    int r = l+lena-1;
+    ll tmp1;
+    for(int i=0;i<2;i++){
+        tmp1 = 1ll*hasha[l-1][i]*base[r-l+1][i];tmp1%=mod[i];
+        res[i] = (hasha[r][i]-(tmp1)%mod[i]+mod[i])%mod[i];
+        res[i]%=mod[i];
+    }
+    return res;
+}
+```