20240417 Finished

src/problem/mod.rs

@@ -103,4 +103,5 @@ mod p55_jump_game;
 mod p45_jump_game_ii;
 mod p274_h_index;
 mod p380_insert_delete_getrandom_o1;
-mod p238_product_of_array_except_self;
+mod p238_product_of_array_except_self;
+mod p134_gas_station;

src/problem/p134_gas_station.rs

@@ -0,0 +1,66 @@
+/**
+ * [134] Gas Station
+ */
+pub struct Solution {}
+
+// submission codes start here
+
+impl Solution {
+    pub fn can_complete_circuit(gas: Vec<i32>, cost: Vec<i32>) -> i32 {
+        let length = gas.len();
+        let mut value = Vec::with_capacity(length * 2);
+
+        for i in 0..length {
+            value.push(gas[i] - cost[i]);
+        }
+
+        if value.iter().sum::<i32>() < 0 {
+            return -1;
+        }
+
+        for i in 0..length {
+            value.push(value[i]);
+        }
+
+        let mut pos = 0;
+        while pos < length {
+            let mut g = 0;
+            let mut flag = true;
+
+            for i in 0..length {
+                g += value[pos + i];
+
+                if g < 0 {
+                    pos = pos + i + 1;
+                    flag = false;
+                    break;
+                }
+            }
+
+            if flag {
+                return pos as i32;
+            }
+        }
+
+        -1
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_134() {
+        assert_eq!(
+            3,
+            Solution::can_complete_circuit(vec![1, 2, 3, 4, 5], vec![3, 4, 5, 1, 2])
+        );
+        assert_eq!(
+            -1,
+            Solution::can_complete_circuit(vec![2, 3, 4], vec![3, 4, 3])
+        );
+    }
+}