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Commit 8536ee6

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Add cpp solution for problem 1024-1028
1 parent cf7575a commit 8536ee6

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5 files changed

+150
-0
lines changed

5 files changed

+150
-0
lines changed
Lines changed: 24 additions & 0 deletions
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class Solution {
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public:
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int videoStitching(vector<vector<int>>& clips, int T) {
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int maxEnding = 0;
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int count = 0;
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vector<int> maxEnd(T+1, 0); // maxEnd[i] : maximum ending time of all videos that start by time i
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for (int i = 0; i < clips.size(); ++i) {
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if (clips[i][0] >= T) continue;
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maxEnd[clips[i][0]] = max(maxEnd[clips[i][0]], clips[i][1]);
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}
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for (int i = 1; i < T; ++i) {
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maxEnd[i] = max(maxEnd[i], maxEnd[i-1]);
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}
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for (int i = 0; i < T; ++i) {
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if (maxEnding == i) { // select video with maximum ending if one more video is necessary
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count ++;
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maxEnding = maxEnd[i];
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} else if (maxEnding < i) {
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return -1;
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}
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}
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return count;
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}
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};
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class Solution {
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unordered_map<int, bool> mem;
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public:
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bool divisorGame(int N) {
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if (N == 1) return false;
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if (mem.count(N)) {
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return mem[N];
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}
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for (int i = 1; i < N; ++i) {
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if (N % i == 0) {
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if (divisorGame(N-i) == false) {
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mem[N] = true;
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return true;
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}
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}
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}
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mem[N] = false;
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return false;
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}
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};
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/**
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* Definition for a binary tree node.
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* struct TreeNode {
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* int val;
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* TreeNode *left;
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* TreeNode *right;
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* TreeNode(int x) : val(x), left(NULL), right(NULL) {}
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* };
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*/
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class Solution {
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int helper(TreeNode* node, int& left, int & right) {
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left = INT_MAX;
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right = INT_MIN;
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if (node == nullptr) {
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return 0;
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}
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left = node->val;
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right = node->val;
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int tmpLeft, tmpRight;
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int res = 0;
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res = max(res, helper(node->left, tmpLeft, tmpRight));
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left = min(left, tmpLeft);
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right = max(right, tmpRight);
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res = max(res, helper(node->right, tmpLeft, tmpRight));
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left = min(left, tmpLeft);
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right = max(right, tmpRight);
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res = max(res, abs(node->val - left));
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res = max(res, abs(node->val - right));
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return res;
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}
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public:
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int maxAncestorDiff(TreeNode* root) {
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int left = 0, right = 0;
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return helper(root, left, right);
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}
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};
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class Solution {
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unordered_map<int, int> tested; // map (start index * 1005 + steps) to longest length
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public:
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int longestArithSeqLength(vector<int>& A) {
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int res = 0;
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for (int i = 0; i < A.size(); ++i) {
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for (int j = 0; j < i; ++j) {
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int diff = A[i] - A[j];
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if (tested.count(j*10005 + diff)) {
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tested[i*10005+diff] = max(tested[i*10005+diff], 1+tested[j*10005 + diff]);
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} else {
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tested[i*10005+diff] = max(tested[i*10005+diff], 2);
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}
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res = max(res, tested[i*10005+diff]);
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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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/**
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* Definition for a binary tree node.
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* struct TreeNode {
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* int val;
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* TreeNode *left;
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* TreeNode *right;
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* TreeNode(int x) : val(x), left(NULL), right(NULL) {}
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* };
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*/
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class Solution {
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public:
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TreeNode* recoverFromPreorder(string S) {
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stack<TreeNode*> st;
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int depth = 0;
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int num = 0;
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for (int i = 0; i < S.length(); ++i) {
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if (S[i] == '-') {
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depth ++;
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} else {
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num = 10*num + S[i]-'0';
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}
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if (i+1 >= S.length() || (isdigit(S[i]) && S[i+1] == '-')) {
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TreeNode * newNode = new TreeNode(num);
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while (st.size() > depth) {
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st.pop();
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}
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if (!st.empty()) {
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if (st.top()->left == nullptr) {
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st.top()->left = newNode;
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} else {
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st.top()->right = newNode;
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}
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}
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st.push(newNode);
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depth = 0;
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num = 0;
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}
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}
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TreeNode* res;
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while (!st.empty()) {
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res = st.top();
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st.pop();
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}
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return res;
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}
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};

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