leetcode

Improved Daily Problem and 5 Random Problems

7 files changed, 107 insertions(+), 9 deletions(-)

diff --git a/ Problems/0890.cpp b/ Problems/0890.cpp

@@ -0,0 +1,28 @@

class Solution {

public:

vector<string> findAndReplacePattern(const vector<string> &words,

const string &pattern) {

vector<string> res;

static int um[27] = {0};

static bool used[27] = {0};

for (const auto &word : words) {

for (int i = 0; i < pattern.size(); i++) {

const uint8_t w = word[i] & 0x1F;

const uint8_t p = pattern[i] & 0x1F;

if (um[w]) {

if (um[w] != p) goto next;

continue;

}

if (used[p]) goto next;

used[p] = true;

um[w] = p;

}

res.push_back(word);

next:;

memset(um, 0x00, sizeof(um));

memset(used, 0x00, sizeof(used));

}

return res;

}

};

diff --git a/ Problems/1381.cpp b/ Problems/1381.cpp

@@ -0,0 +1,21 @@

class CustomStack {

vector<int> st;

int size = 0;

public:

CustomStack(int maxSize) : st(maxSize) {}

void push(int x) {

if (size == st.size()) return;

st[size++] = x;

}

int pop() {

if (size == 0) return -1;

return st[--size];

}

void increment(int k, int val) {

for (int i = 0; i < min(k, size); i++) st[i] += val;

}

};

diff --git a/ Problems/1615.cpp b/ Problems/1615.cpp

@@ -1,17 +1,20 @@ class Solution { public: int maximalNetworkRank(int n, vector<vector<int>> &roads) {

vector<unordered_set<int>> adj(n, unordered_set<int>());

for (auto &p : roads) {

adj[p[0]].insert(p[1]);

adj[p[1]].insert(p[0]);

}

int mat[101][101] = {0}, degree[101] = {0};

int res = 0;

for (int i = 0; i < n; i++)

for (int j = i + 1; j < n; j++)

res = max(res, (int)(adj[i].size() + adj[j].size() - adj[i].count(j)));

for (int i = 0; i < roads.size(); i++) {

int u = roads[i][0], v = roads[i][1];

degree[u]++, degree[v]++;

mat[u][v] = mat[v][u] = 1;

}

for (int i = 0; i < n; i++) {

for (int j = i + 1; j < n; j++) {

res = max(res, degree[i] + degree[j] - mat[i][j]);

}

}

return res; } };

diff --git a/ Problems/1641.cpp b/ Problems/1641.cpp

@@ -0,0 +1,10 @@

class Solution {

public:

int countVowelStrings(int n) {

int vec[5] = {1, 1, 1, 1, 1};

for (int i = 1; i <= n; i++) {

for (int i = 4, sum = 0; i >= 0; i--) vec[i] = sum += vec[i];

}

return vec[0];

}

};

diff --git a/ Problems/1829.cpp b/ Problems/1829.cpp

@@ -0,0 +1,12 @@

class Solution {

public:

vector<int> getMaximumXor(vector<int> &nums, int maximumBit) {

const int n = nums.size(), mask = (1 << maximumBit) - 1;

vector<int> res(n);

for (int i = 0, acc = 0; i < n; i++) {

nums[i] = acc ^= nums[i];

res[n - i - 1] = nums[i] ^ mask;

}

return res;

}

};

diff --git a/ Problems/2415.cpp b/ Problems/2415.cpp

@@ -0,0 +1,19 @@

class Solution {

public:

TreeNode *reverseOddLevels(TreeNode *root) {

static vector<TreeNode *> vec(8192);

queue<TreeNode *> q({root});

for (int lvl = 0; !q.empty(); lvl++) {

for (int k = q.size() - 1; k >= 0; k--) {

vec[k] = q.front();

q.pop();

if (vec[k]->left) q.push(vec[k]->left);

if (vec[k]->right) q.push(vec[k]->right);

}

if (lvl % 2 == 0) continue;

int i = 0, j = (1 << lvl) - 1;

while (i < j) swap(vec[i++]->val, vec[j--]->val);

}

return root;

}

};

diff --git a/ README.md b/ README.md

@@ -388,6 +388,7 @@ for solving problems. | 0881 | Medium | [Boats to Save People](Problems/0881.cpp) | | 0884 | Easy | [Uncommon Words from Two Sentences](Problems/0884.cpp) | | 0886 | Medium | [Possible Bipartition](Problems/0886.cpp) |

| 0890 | Medium | [Find and Replace Pattern](Problems/0890.cpp) |

| 0894 | Medium | [All Possible Full Binary Trees](Problems/0894.cpp) | | 0897 | Easy | [Increasing Order Search Tree](Problems/0897.cpp) | | 0901 | Medium | [Online Stock Span](Problems/0901.cpp) |

@@ -485,6 +486,7 @@ for solving problems. | 1373 | Hard | [Maximum Sum BST in Binary Tree](Problems/1373.cpp) | | 1376 | Medium | [Time Needed to Inform All Employees](Problems/1376.cpp) | | 1379 | Easy | [Find a Corresponding Node of a Binary Tree in a Clone of That Tree](Problems/1379.cpp) |

| 1381 | Medium | [Design a Stack With Increment Operation](Problems/1381.cpp) |

| 1382 | Medium | [Balance a Binary Search Tree](Problems/1382.cpp) | | 1396 | Medium | [Design Underground System](Problems/1396.cpp) | | 1402 | Hard | [Reducing Dishes](Problems/1402.cpp) |

@@ -532,6 +534,7 @@ for solving problems. | 1630 | Medium | [Arithmetic Subarrays](Problems/1630.cpp) | | 1637 | Medium | [Widest Vertical Area Between Two Points Containing No Points](Problems/1637.cpp) | | 1639 | Hard | [Number of Ways to Form a Target String Given a Dictionary](Problems/1639.cpp) |

| 1641 | Medium | [Count Sorted Vowel Strings](Problems/1641.cpp) |

| 1646 | Easy | [Get Maximum in Generated Array](Problems/1646.cpp) | | 1669 | Medium | [Merge In Between Linked Lists](Problems/1669.cpp) | | 1672 | Easy | [Richest Customer Wealth](Problems/1672.cpp) |

@@ -556,6 +559,7 @@ for solving problems. | 1822 | Easy | [Sign of the Product of an Array](Problems/1822.cpp) | | 1823 | Medium | [Find the Winner of the Circular Game](Problems/1823.cpp) | | 1828 | Medium | [Queries on Number of Points Inside a Circle](Problems/1828.cpp) |

| 1829 | Medium | [Maximum XOR for Each Query](Problems/1829.cpp) |

| 1833 | Medium | [Maximum Ice Cream Bars](Problems/1833.cpp) | | 1834 | Medium | [Single-Threaded CPU](Problems/1834.cpp) | | 1857 | Hard | [Largest Color Value in a Directed Graph](Problems/1857.cpp) |

@@ -622,6 +626,7 @@ for solving problems. | 2391 | Medium | [Minimum Amount of Time to Collect Garbage](Problems/2391.cpp) | | 2396 | Medium | [Strictly Palindromic Number](Problems/2396.cpp) | | 2405 | Medium | [Optimal Partition of String](Problems/2405.cpp) |

| 2415 | Medium | [Reverse Odd Levels of Binary Tree](Problems/2415.cpp) |

| 2421 | Medium | [Number of Good Paths](Problems/2421.cpp) | | 2433 | Medium | [Find The Original Array of Prefix Xor](Problems/2433.cpp) | | 2439 | Medium | [Minimize Maximum of Array](Problems/2439.cpp) |