leetcode

Daily Problem and 5 Random Problems

7 files changed, 122 insertions(+), 0 deletions(-)

diff --git a/ Problems/0097.cpp b/ Problems/0097.cpp

@@ -0,0 +1,23 @@

class Solution {

short int dp[101][101];

bool rec(const string &s1, const string &s2, const string &s3, int i = 0,

int j = 0, int k = 0) {

if (k == s3.size()) return true;

if (dp[i][j] != -1) return dp[i][j];

if (i != s1.size() && s1[i] == s3[k] && rec(s1, s2, s3, i + 1, j, k + 1))

return dp[i][j] = true;

if (j != s2.size() && s2[j] == s3[k] && rec(s1, s2, s3, i, j + 1, k + 1))

return dp[i][j] = true;

return dp[i][j] = false;

}

public:

Solution() { memset(dp, 0xFF, sizeof(dp)); }

bool isInterleave(const string &s1, const string &s2, const string &s3) {

if (s1.size() + s2.size() != s3.size()) return false;

return rec(s1, s2, s3);

}

};

diff --git a/ Problems/0406.cpp b/ Problems/0406.cpp

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

class Solution {

public:

vector<vector<int>> reconstructQueue(vector<vector<int>> &people) {

sort(begin(people), end(people), [](const auto &a, const auto &b) {

return a[0] > b[0] || (a[0] == b[0] && a[1] < b[1]);

});

vector<vector<int>> res;

res.reserve(people.size());

for (const auto &p : people) res.insert(res.begin() + p[1], p);

return res;

}

};

diff --git a/ Problems/0442.cpp b/ Problems/0442.cpp

@@ -0,0 +1,15 @@

class Solution {

public:

vector<int> findDuplicates(vector<int> &nums) {

vector<int> res;

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

int idx = abs(nums[i]) - 1;

if (nums[idx] < 0)

res.push_back(idx + 1);

else

nums[idx] = -nums[idx];

}

return res;

}

};

diff --git a/ Problems/1286.cpp b/ Problems/1286.cpp

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

class Solution {

vector<int> vec;

const string chars;

string res;

bool has_next = true;

void shuffle() {

int goal = chars.size() - 1, idx = vec.size() - 1;

while (idx > 0 && vec[idx] == goal) goal--, idx--;

for (int i = idx, acc = vec[idx]; i < vec.size(); i++)

res[i] = chars[vec[i] = ++acc];

if (idx == 0 && vec[0] == goal) has_next = false;

}

public:

CombinationIterator(string chars, int len)

: chars(chars), vec(len), res(len, ' ') {

for (int i = 0; i < len; i++) res[i] = chars[vec[i] = i];

vec.back()--;

}

string next() {

shuffle();

return res;

}

bool hasNext() { return has_next; }

};

diff --git a/ Problems/1415.cpp b/ Problems/1415.cpp

@@ -0,0 +1,26 @@

class Solution {

vector<string> res;

string crnt;

void rec(int n, int k, char last = 'x') {

if (res.size() == k) return;

if (crnt.size() == n) {

res.push_back(crnt);

return;

}

crnt.push_back(' ');

for (char c = 'a'; c <= 'c'; c++) {

if (c == last) continue;

crnt.back() = c;

rec(n, k, c);

}

crnt.pop_back();

}

public:

string getHappyString(int n, int k) {

if (k > 3 * (1 << n - 1)) return "";

rec(n, k);

return res.back();

}

};

diff --git a/ Problems/2294.cpp b/ Problems/2294.cpp

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

class Solution {

public:

int partitionArray(vector<int> &nums, int k) {

sort(begin(nums), end(nums));

int res = 1, j = 0;

for (int i = 1; i < nums.size(); i++) {

if (nums[i] - nums[j] > k) j = i, res++;

}

return res;

}

};

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

@@ -113,6 +113,7 @@ for solving problems. | 0094 | Easy | [Binary Tree Inorder Traversal](Problems/0094.cpp) | | 0095 | Medium | [Unique Binary Search Trees II](Problems/0095.cpp) | | 0096 | Medium | [Unique Binary Search Trees](Problems/0096.cpp) |

| 0097 | Medium | [Interleaving String](Problems/0097.cpp) |

| 0098 | Medium | [Validate Binary Search Tree](Problems/0098.cpp) | | 0099 | Medium | [Recover Binary Search Tree](Problems/0099.cpp) | | 0100 | Easy | [Same Tree](Problems/0100.cpp) |

@@ -266,6 +267,7 @@ for solving problems. | 0399 | Medium | [Evaluate Division](Problems/0399.cpp) | | 0402 | Medium | [Remove K Digits](Problems/0402.cpp) | | 0404 | Easy | [Sum of Left Leaves](Problems/0404.cpp) |

| 0406 | Medium | [Queue Reconstruction by Height](Problems/0406.cpp) |

| 0409 | Easy | [Longest Palindrome](Problems/0409.cpp) | | 0412 | Easy | [Fizz Buzz](Problems/0412.cpp) | | 0413 | Medium | [Arithmetic Slices](Problems/0413.cpp) |

@@ -282,6 +284,7 @@ for solving problems. | 0435 | Medium | [Non-overlapping Intervals](Problems/0435.cpp) | | 0437 | Medium | [Path Sum III](Problems/0437.cpp) | | 0438 | Medium | [Find All Anagrams in a String](Problems/0438.cpp) |

| 0442 | Medium | [Find All Duplicates in an Array](Problems/0442.cpp) |

| 0443 | Medium | [String Compression](Problems/0443.cpp) | | 0445 | Medium | [Add Two Numbers II](Problems/0445.cpp) | | 0448 | Easy | [Find All Numbers Disappeared in an Array](Problems/0448.cpp) |

@@ -473,6 +476,7 @@ for solving problems. | 1261 | Medium | [Find Elements in a Contaminated Binary Tree](Problems/1261.cpp) | | 1277 | Medium | [Count Square Submatrices with All Ones](Problems/1277.cpp) | | 1282 | Medium | [Group the People Given the Group Size They Belong To](Problems/1282.cpp) |

| 1286 | Medium | [Iterator for Combination](Problems/1286.cpp) |

| 1290 | Easy | [Convert Binary Number in a Linked List to Integer](Problems/1290.cpp) | | 1302 | Medium | [Deepest Leaves Sum](Problems/1302.cpp) | | 1305 | Medium | [All Elements in Two Binary Search Trees](Problems/1305.cpp) |

@@ -505,6 +509,7 @@ for solving problems. | 1402 | Hard | [Reducing Dishes](Problems/1402.cpp) | | 1406 | Hard | [Stone Game III](Problems/1406.cpp) | | 1409 | Medium | [Queries on a Permutation With Key](Problems/1409.cpp) |

| 1415 | Medium | [The k-th Lexicographical String of All Happy Strings of Length n](Problems/1415.cpp) |

| 1416 | Hard | [Restore The Array](Problems/1416.cpp) | | 1418 | Medium | [Display Table of Food Orders in a Restaurant](Problems/1418.cpp) | | 1425 | Hard | [Constrained Subsequence Sum](Problems/1425.cpp) |

@@ -625,6 +630,7 @@ for solving problems. | 2272 | Hard | [Substring With Largest Variance](Problems/2272.cpp) | | 2279 | Medium | [Maximum Bags With Full Capacity of Rocks](Problems/2279.cpp) | | 2285 | Medium | [Maximum Total Importance of Roads](Problems/2285.cpp) |

| 2294 | Medium | [Partition Array Such That Maximum Difference Is K](Problems/2294.cpp) |

| 2300 | Medium | [Successful Pairs of Spells and Potions](Problems/2300.cpp) | | 2305 | Medium | [Fair Distribution of Cookies](Problems/2305.cpp) | | 2306 | Hard | [Naming a Company](Problems/2306.cpp) |