leetcode

Data Structure II: Day 2

3 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/ Problems/0075.cpp b/ Problems/0075.cpp

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

class Solution {

public:

void sortColors(vector<int> &nums) {

array<int, 3> arr;

for (int n : nums) arr[n]++;

int count = 0;

for (int i = 0; i < 3; i++)

while (arr[i]--) nums[count++] = i;

}

};

diff --git a/ Problems/0706.cpp b/ Problems/0706.cpp

@@ -0,0 +1,32 @@

class MyHashMap {

const int mod = 9973;

vector<vector<pair<int, int>>> hm;

int hash(int key) { return key % mod; }

int &find(int key) {

static int err = -1;

for (auto &[k, v] : hm[hash(key)])

if (k == key) return v;

return err;

}

public:

MyHashMap() : hm(mod) {}

void put(int key, int value) {

int &loc = find(key);

if (loc == -1)

hm[hash(key)].push_back({key, value});

else

loc = value;

}

int get(int key) { return find(key); }

void remove(int key) {

vector<pair<int, int>> &row = hm[hash(key)];

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

if (row[i].first == key) {

row.erase(row.begin() + i);

break;

}

}

};

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

@@ -64,6 +64,7 @@ for solving problems. | 0067 | Easy | [Add Binary](Problems/0067.cpp) | | 0070 | Easy | [Climbing Stairs](Problems/0070.cpp) | | 0074 | Medium | [Search a 2D Matrix](Problems/0074.cpp) |

| 0075 | Medium | [Sort Colors](Problems/0075.cpp) |

| 0077 | Medium | [Combinations](Problems/0077.cpp) | | 0083 | Easy | [Remove Duplicates from Sorted List](Problems/0083.cpp) | | 0084 | Hard | [Largest Rectangle in Histogram](Problems/0084.cpp) |

@@ -238,6 +239,7 @@ for solving problems. | 0700 | Easy | [Search in a Binary Search Tree](Problems/0700.cpp) | | 0701 | Medium | [Insert into a Binary Search Tree](Problems/0701.cpp) | | 0704 | Easy | [Binary Search](Problems/0704.cpp) |

| 0706 | Easy | [Design HashMap](Problems/0706.cpp) |

| 0707 | Medium | [Design Linked List](Problems/0707.cpp) | | 0714 | Medium | [Best Time to Buy and Sell Stock with Transaction Fee](Problems/0714.cpp) | | 0724 | Easy | [Find Pivot Index](Problems/0724.cpp) |