标题: LeetCode //C - 365. Water and Jug Problem [打印本页] 作者: 立聪堂德州十三局店 时间: 2024-9-18 06:10 标题: LeetCode //C - 365. Water and Jug Problem 365. Water and Jug Problem
You are given two jugs with capacities x liters and y liters. You have an infinite water supply. Return whether the total amount of water in both jugs may reach target using the following operations:
Fill either jug completely with water.
Completely empty either jug.
Pour water from one jug into another until the receiving jug is full, or the transferring jug is empty.
Example 1:
Input: x = 3, y = 5, target = 4 Output: true Explanation:
Follow these steps to reach a total of 4 liters:
Fill the 5-liter jug (0, 5).
Pour from the 5-liter jug into the 3-liter jug, leaving 2 liters (3, 2).
Empty the 3-liter jug (0, 2).
Transfer the 2 liters from the 5-liter jug to the 3-liter jug (2, 0).
Fill the 5-liter jug again (2, 5).
Pour from the 5-liter jug into the 3-liter jug until the 3-liter jug is full. This leaves 4 liters in the 5-liter jug (3, 4).
7.Empty the 3-liter jug. Now, you have exactly 4 liters in the 5-liter jug (0, 4).
Reference: The Die Hard example.
Example 2:
Input: x = 2, y = 6, target = 5 Output: false
Example 3:
Input: x = 1, y = 2, target = 3 Output: true Explanation: Fill both jugs. The total amount of water in both jugs is equal to 3 now.
Constraints:
1 < = x , y , t a r g e t < = 1 0 3 1 <= x, y, target <= 10^3 1<=x,y,target<=103
From: LeetCode
Link: 365. Water and Jug Problem Solution:
Ideas:
gcd Function: Computes the greatest common divisor using the Euclidean algorithm.
canMeasureWater Function:
First checks if target is achievable given the capacities of the two jugs.
Then checks if target is a multiple of the GCD of the jug capacities.
Code:
// Helper function to compute the greatest common divisor
int gcd(int a, int b) {
while (b != 0) {
int temp = b;
b = a % b;
a = temp;
}
return a;
}
bool canMeasureWater(int x, int y, int target) {
// If target is greater than the sum of both jugs, it's not possible
if (target > x + y) {
return false;
}
// If target is zero, it's always possible (no need to fill any jug)
if (target == 0) {
return true;
}
// Calculate the greatest common divisor of x and y
int g = gcd(x, y);
// Check if target is a multiple of the gcd of x and y