59 lines
1.6 KiB
Java
59 lines
1.6 KiB
Java
//给定一个正整数 n，找出小于或等于 n 的非负整数中，其二进制表示不包含 连续的1 的个数。
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//
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// 示例 1:
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//
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// 输入: 5
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//输出: 5
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//解释:
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//下面是带有相应二进制表示的非负整数<= 5：
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//0 : 0
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//1 : 1
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//2 : 10
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//3 : 11
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//4 : 100
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//5 : 101
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//其中，只有整数3违反规则（有两个连续的1），其他5个满足规则。
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//
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// 说明: 1 <= n <= 10⁹
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// Related Topics 动态规划 👍 226 👎 0
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package leetcode.editor.cn;
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//600:不含连续1的非负整数
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class NonNegativeIntegersWithoutConsecutiveOnes {
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public static void main(String[] args) {
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//测试代码
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Solution solution = new NonNegativeIntegersWithoutConsecutiveOnes().new Solution();
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}
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//力扣代码
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//leetcode submit region begin(Prohibit modification and deletion)
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class Solution {
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public int findIntegers(int n) {
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int[] dp = new int[31];
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dp[0] = dp[1] = 1;
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for (int i = 2; i < 31; ++i) {
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dp[i] = dp[i - 1] + dp[i - 2];
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}
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int pre = 0, res = 0;
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for (int i = 29; i >= 0; --i) {
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int val = 1 << i;
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if ((n & val) != 0) {
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res += dp[i + 1];
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if (pre == 1) {
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break;
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}
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pre = 1;
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} else {
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pre = 0;
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}
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if (i == 0) {
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++res;
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}
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}
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return res;
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}
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}
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//leetcode submit region end(Prohibit modification and deletion)
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} |