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1269:停在原地的方案数

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huangge1199 2021-05-13 16:25:09 +08:00
parent 7a208f7f16
commit e5888782c3
1 changed files with 3 additions and 2 deletions
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src/main/java/leetcode/editor/cn/NumberOfWaysToStayInTheSamePlaceAfterSomeSteps.java
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@ -71,10 +71,11 @@ public class NumberOfWaysToStayInTheSamePlaceAfterSomeSteps {
result[0][1] = 1;
for (int i = 1; i <= steps; i++) {
for (int j = 1; j <= min; j++) {
result[i % 2][j] = ((result[(1 - i % 2) & 1][j - 1] + result[(1 - i % 2) & 1][j]) % (1000000007) + result[(1 - i % 2) & 1][j + 1]) % (1000000007);
// result[i % 2][j] = ((result[1 - i % 2][j - 1] + result[1 - i % 2][j]) % (1000000007) + result[1 - i % 2][j + 1]) % (1000000007);
result[i & 1][j] = ((result[(i - 1) & 1][j - 1] + result[(i - 1) & 1][j]) % (1000000007) + result[(i - 1) & 1][j + 1]) % (1000000007);
}
}
return result[steps % 2][1];
return result[steps & 1][1];
}
}
//leetcode submit region end(Prohibit modification and deletion)