here is a fast way to input integers/long longs

i realized that there are no codes to help make input faster... so here goes nothing. to make it long long just change the data types.

Input/fast-input.cpp

@@ -0,0 +1,38 @@
+#include <bits/stdc++.h>
+using namespace std;
+inline int readInt_neg() {
+    int x = 0;
+    bool neg=false;
+    char ch = getchar();
+    while ((ch < '0' || ch > '9') && ch!='-') ch = getchar();
+    if (ch=='-'){
+        neg=true;
+        ch=getchar();
+    }
+    while (ch >= '0' && ch <= '9'){
+		x = (x << 3) + (x << 1) + ch - '0';
+		ch = getchar();
+	}
+	if (neg){
+        return -x;
+	}
+    return x;
+}
+inline int readInt_non_neg() {
+    int x = 0;
+    bool neg=false;
+    char ch = getchar();
+    while (ch < '0' || ch > '9') ch = getchar();
+    while (ch >= '0' && ch <= '9'){
+		x = (x << 3) + (x << 1) + ch - '0';
+		ch = getchar();
+	}
+    return x;
+}
+// can replace getchar() with getchar_unlock() if its faster
+// this is significantly faster than scanf
+int main(){
+    printf("%d\n",readInt_non_neg()); //use this for non negative number
+    printf("%d\n",readInt_neg()); // use this for negative number
+    return 0;
+}