1 files changed, 81 insertions, 0 deletions
diff --git a/rotting-oranges/src/main.rs b/rotting-oranges/src/main.rs
new file mode 100644
index 0000000..a975aa1
--- /dev/null
+++ b/rotting-oranges/src/main.rs
@@ -0,0 +1,81 @@
+fn main() {
+    let tests: Vec<Vec<Vec<i32>>> = vec![
+        vec![
+            vec![2,1,1],
+            vec![1,1,0],
+            vec![0,1,1]
+        ],
+        vec![
+            vec![2,1,1],
+            vec![0,1,1],
+            vec![1,0,1]
+        ],
+        vec![
+            vec![0,2]
+        ],
+        vec![
+            vec![1,2]
+        ]
+    ];
+    let outputs = [4,-1,0,1];
+    for (n, test) in tests.iter().enumerate() {
+        let c: Vec<Vec<i32>> = test.to_vec();
+        let result = oranges_rotting(c);
+        println!("test {} result {} should be {}", n, result, outputs[n]);
+    }
+}
+
+
+fn oranges_rotting(grid: Vec<Vec<i32>>) -> i32 {
+    let mut grid1 = grid.clone();
+    let mut grid2 = grid1.clone();
+
+    let mut minutes: i32 = -1;
+    let mut some_fresh: bool = true;
+    let mut some_different: bool;
+    while some_fresh {
+        some_fresh = false;
+        some_different = false;
+
+        // println!("Minute {}", minutes);
+
+        for (x, row) in grid1.iter().enumerate() {
+            for (y, col) in row.iter().enumerate() {
+                some_fresh |= *col == 1;
+                if *col != 2 {continue;}
+                let r: [i32; 3] = [-1,0,1];
+                for ix in r {
+                    for iy in r {
+                        if ix.abs() == iy.abs() {continue;}
+                        let field: &mut i32 = &mut grid2[
+                            (x as i32 + ix).clamp(0,grid.len() as i32 -1) as usize
+                        ][
+                            (y as i32 + iy).clamp(0,grid[0].len() as i32 -1) as usize
+                        ];
+                        if *field == 1 {
+                            some_different = true;
+                            *field = 2;
+                        }
+                    }
+                }
+            }
+            // println!("{:?} {:?}", row, grid2[x]);
+        }
+        // for (x, row) in grid1.iter().enumerate() {
+        //     for (y, col) in row.iter().enumerate() {
+        //         some_different |= grid1[x][y] != grid2[x][y];
+        //     }
+        // }
+
+        if !some_different && some_fresh {
+            // println!("impossible");
+            return -1;
+        }
+
+        grid1 = grid2;
+        grid2 = grid1.clone();
+        minutes += 1;
+    }
+    return minutes;
+}
+