Compilare: warning: unnecessary parentheses around `while` condition --> main.rs:23:11 | 23 | while (i * i <= n) { | ^^^^^^^^^^^^ help: remove these parentheses | = note: #[warn(unused_parens)] on by default warning: unnecessary parentheses around `while` condition --> main.rs:26:19 | 26 | while (i * j <= n) { | ^^^^^^^^^^^^ help: remove these parentheses warning: variable does not need to be mutable --> main.rs:16:6 | 16 | let mut n= read("ciur.in") as usize; | ----^ | | | help: remove this `mut` | = note: #[warn(unused_mut)] on by default