.cargo/config.toml

@@ -1,3 +0,0 @@
-[build]
-target = "x86_64-unknown-linux-musl"
-rustflags = "-C target-cpu=native -C strip=symbols"

src/main.rs

@@ -1,5 +1,3 @@
-use std::time::Instant;
-
 struct SField {
     field: Vec<usize>,
     fixed: Vec<usize>,
@@ -403,11 +401,9 @@ impl SField {
 
     #[inline(always)]
     fn solve(&mut self) {
-        let now = Instant::now();
         if !self.solve_backtracking() {
             println!("there is no solution.");
         }
-        println!("took {:.3}s", now.elapsed().as_secs_f64());
     }
 }