Commit d1afef3

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20200820

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Lines changed: 37 additions & 0 deletions

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	`1`	`+/*`
	`2`	`+ * @lc app=leetcode id=1155 lang=java`
	`3`	`+ *`
	`4`	`+ * [1155] Number of Dice Rolls With Target Sum`
	`5`	`+ */`
	`6`	`+`
	`7`	`+// @lc code=start`
	`8`	`+class Solution {`
	`9`	`+ /*`
	`10`	`+ dfs会超时, dfs+memo`
	`11`	`+ time: O(d * f * target)`
	`12`	`+ space: O(d * f)`
	`13`	`+ */`
	`14`	`+ public int numRollsToTarget(int d, int f, int target) {`
	`15`	`+ int[][] memo = new int[d + 1][target + 1];`
	`16`	`+ for (int[] arr : memo) {`
	`17`	`+ Arrays.fill(arr, -1);`
	`18`	`+ }`
	`19`	`+ return dfs(d, f, target, memo);`
	`20`	`+ }`
	`21`	`+`
	`22`	`+ private int dfs(int d, int f, int target, int[][] memo) {`
	`23`	`+ if (d == 0 \|\| target <= 0) {`
	`24`	`+ return d == 0 && target == 0 ? 1 : 0;`
	`25`	`+ }`
	`26`	`+ if (memo[d][target] != -1) return memo[d][target];`
	`27`	`+ int res = 0;`
	`28`	`+ for (int i = 1; i <= f; ++i) {`
	`29`	`+ res += dfs(d - 1, f, target - i, memo);`
	`30`	`+ res %= 1000000007;`
	`31`	`+ }`
	`32`	`+ memo[d][target] = res;`
	`33`	`+ return res;`
	`34`	`+ }`
	`35`	`+}`
	`36`	`+// @lc code=end`
	`37`	`+`

Lines changed: 34 additions & 0 deletions

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	`1`	`+/*`
	`2`	`+ * @lc app=leetcode id=824 lang=java`
	`3`	`+ *`
	`4`	`+ * [824] Goat Latin`
	`5`	`+ */`
	`6`	`+`
	`7`	`+// @lc code=start`
	`8`	`+class Solution {`
	`9`	`+ public String toGoatLatin(String S) {`
	`10`	`+ Set<Character> set = new HashSet<>(Arrays.asList('a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'));`
	`11`	`+ String[] strs = S.split(" ");`
	`12`	`+ StringBuilder[] sbs = new StringBuilder[strs.length];`
	`13`	`+ for (int i = 0; i < sbs.length; ++i) {`
	`14`	`+ sbs[i] = new StringBuilder();`
	`15`	`+ }`
	`16`	`+ for (int i = 0; i < sbs.length; ++i) {`
	`17`	`+ if (set.contains(strs[i].charAt(0))) {`
	`18`	`+ sbs[i].append(strs[i]);`
	`19`	`+ } else {`
	`20`	`+ sbs[i].append(strs[i].substring(1)).append(strs[i].charAt(0));`
	`21`	`+ }`
	`22`	`+ sbs[i].append("ma");`
	`23`	`+ for (int j = 0; j <= i; ++j) {`
	`24`	`+ sbs[i].append("a");`
	`25`	`+ }`
	`26`	`+ }`
	`27`	`+ for (int i = 1; i < sbs.length; ++i) {`
	`28`	`+ sbs[0].append(" ").append(sbs[i]);`
	`29`	`+ }`
	`30`	`+ return sbs[0].toString();`
	`31`	`+ }`
	`32`	`+}`
	`33`	`+// @lc code=end`
	`34`	`+`

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