add: fast io

misc/fastio.cc

@@ -0,0 +1,22 @@
+char *p1,*p2,buf[100000];
+#define nc() (p1==p2 && (p2=(p1=buf)+fread(buf,1,100000,stdin),p1==p2)?EOF:*p1++)
+inline int fastread() {
+    int x=0,f=1;
+    char ch=nc();
+    while(ch<48||ch>57) {
+        if(ch=='-') f=-1;
+        ch=nc();
+    }
+    while(ch>=48&&ch<=57)
+        x=x*10+ch-48,ch=nc();
+    return x*f;
+}
+
+void fastwrite(int x) {
+    if(x<0) putchar('-'),x=-x;
+    if(x>9) fastwrite(x/10);
+    putchar(x%10+'0');
+    return;
+}
+
+