@@ -130,8 +130,11 @@ public S allProd() {
     }
 
     public void apply(int p, F f) {
-        Dat[p] = Mapping.apply(f, get(p));
-        updateFrom(p + N);
+        exclusiveRangeCheck(p);
+        p += N;
+        pushTo(p);
+        Dat[p] = Mapping.apply(f, Dat[p]);
+        updateFrom(p);
     }
 
     public void apply(int l, int r, F f) {
Original file line number	Diff line number	Diff line change
`@@ -130,8 +130,11 @@ public S allProd() {`
`130`	`130`	`}`
`131`	`131`
`132`	`132`	`public void apply(int p, F f) {`
`133`		`- Dat[p] = Mapping.apply(f, get(p));`
`134`		`- updateFrom(p + N);`
	`133`	`+ exclusiveRangeCheck(p);`
	`134`	`+ p += N;`
	`135`	`+ pushTo(p);`
	`136`	`+ Dat[p] = Mapping.apply(f, Dat[p]);`
	`137`	`+ updateFrom(p);`
`135`	`138`	`}`
`136`	`139`
`137`	`140`	`public void apply(int l, int r, F f) {`