Class Solution
- java.lang.Object
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- g1101_1200.s1155_number_of_dice_rolls_with_target_sum.Solution
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public class Solution extends Object
1155 - Number of Dice Rolls With Target Sum.Medium
You have
n
dice and each die hask
faces numbered from1
tok
.Given three integers
n
,k
, andtarget
, return the number of possible ways (out of thekn
total ways) to roll the dice so the sum of the face-up numbers equalstarget
. Since the answer may be too large, return it modulo109 + 7
.Example 1:
Input: n = 1, k = 6, target = 3
Output: 1
Explanation: You throw one die with 6 faces.
There is only one way to get a sum of 3.
Example 2:
Input: n = 2, k = 6, target = 7
Output: 6
Explanation: You throw two dice, each with 6 faces.
There are 6 ways to get a sum of 7: 1+6, 2+5, 3+4, 4+3, 5+2, 6+1.
Example 3:
Input: n = 30, k = 30, target = 500
Output: 222616187
Explanation: The answer must be returned modulo 109 + 7.
Constraints:
1 <= n, k <= 30
1 <= target <= 1000
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Constructor Summary
Constructors Constructor Description Solution()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
numRollsToTarget(int n, int k, int target)
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