leetcode

Daily Problem and 4 Random Problems

6 files changed, 93 insertions(+), 0 deletions(-)

diff --git a/ Problems/0030.cpp b/ Problems/0030.cpp

@@ -0,0 +1,36 @@

static auto _ = []() {

ios_base::sync_with_stdio(false);

cin.tie(NULL);

cout.tie(NULL);

return 0;

};

class Solution {

static bool check(const unordered_map<string, int> &count, const string &s, int len) {

static unordered_map<string, int> lcount;

lcount.clear();

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

string word = s.substr(i, len);

const auto it = count.find(word);

if (it == count.end()) return false;

if (++lcount[word] > it->second) return false;

}

return true;

}

public:

vector<int> findSubstring(const string &s, const vector<string> &words) const {

const int n = words.size(), m = words[0].size();

unordered_map<string, int> count;

for (const string &word : words)

count[word]++;

vector<int> res;

for (int i = 0; i + m * n <= s.size(); i++) {

if (check(count, s.substr(i, m * n), m)) {

res.push_back(i);

}

}

return res;

}

};

diff --git a/ Problems/0123.cpp b/ Problems/0123.cpp

@@ -0,0 +1,16 @@

class Solution {

public:

int maxProfit(const vector<int> &prices) const {

int cost1 = INT_MAX, cost2 = INT_MAX;

int profit1 = 0, profit2 = 0;

for (const int price : prices) {

cost1 = min(cost1, price);

profit1 = max(profit1, price - cost1);

cost2 = min(cost2, price - profit1);

profit2 = max(profit2, price - cost2);

}

return profit2;

}

};

diff --git a/ Problems/0183.sql b/ Problems/0183.sql

@@ -0,0 +1,5 @@

SELECT C.Name as Customers

FROM Customers C

LEFT JOIN Orders O

ON C.Id = O.CustomerId

WHERE O.CustomerId is NULL

diff --git a/ Problems/0188.cpp b/ Problems/0188.cpp

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

class Solution {

public:

int maxProfit(const int k, const vector<int> &prices) const {

vector<int> cost(k + 1, INT_MAX), profit(k + 1, 0);

for (const int price : prices) {

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

cost[i] = min(cost[i], price - profit[i - 1]);

profit[i] = max(profit[i], price - cost[i]);

}

}

return profit[k];

}

};

diff --git a/ Problems/2706.cpp b/ Problems/2706.cpp

@@ -0,0 +1,16 @@

class Solution {

public:

int buyChoco(const vector<int> &prices, int money) const {

int a = prices[0], b = prices[1];

if (a > b) swap(a, b);

for (int i = 2; i < prices.size(); i++) {

if (a > prices[i]) {

b = a;

a = prices[i];

} else if (b > prices[i]) {

b = prices[i];

}

}

return a + b <= money ? money - (a + b) : money;

}

};

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

@@ -53,6 +53,7 @@ for solving problems. | 0027 | Easy | [Remove Element](Problems/0027.cpp) | | 0028 | Medium | [Find the Index of the First Occurrence in a String](Problems/0028.cpp) | | 0029 | Medium | [Divide Two Integers](Problems/0029.cpp) |

| 0030 | Hard | [Substring with Concatenation of All Words](Problems/0030.cpp) |

| 0031 | Medium | [Next Permutation](Problems/0031.cpp) | | 0032 | Hard | [Longest Valid Parentheses](Problems/0032.cpp) | | 0033 | Medium | [Search in Rotated Sorted Array](Problems/0033.cpp) |

@@ -142,6 +143,7 @@ for solving problems. | 0120 | Medium | [Triangle](Problems/0120.cpp) | | 0121 | Easy | [Best Time to Buy and Sell Stock](Problems/0121.cpp) | | 0122 | Medium | [Best Time to Buy and Sell Stock II](Problems/0122.cpp) |

| 0123 | Hard | [Best Time to Buy and Sell Stock III](Problems/0123.cpp) |

| 0124 | Hard | [Binary Tree Maximum Path Sum](Problems/0124.cpp) | | 0125 | Easy | [Valid Palindrome](Problems/0125.cpp) | | 0127 | Hard | [Word Ladder](Problems/0127.cpp) |

@@ -187,9 +189,11 @@ for solving problems. | 0180 | Medium | [Consecutive Numbers](Problems/0180.cpp) | | 0181 | Easy | [Employees Earning More Than Their Managers](Problems/0181.cpp) | | 0182 | Easy | [Duplicate Emails](Problems/0182.cpp) |

| 0183 | Easy | [Customers Who Never Order](Problems/0183.cpp) |

| 0184 | Medium | [Department Highest Salary](Problems/0184.cpp) | | 0185 | Hard | [Department Top Three Salaries](Problems/0185.cpp) | | 0187 | Medium | [Repeated DNA Sequences](Problems/0187.cpp) |

| 0188 | Hard | [Best Time to Buy and Sell Stock IV](Problems/0188.cpp) |

| 0189 | Medium | [Rotate Array](Problems/0189.cpp) | | 0190 | Easy | [Reverse Bits](Problems/0190.cpp) | | 0191 | Easy | [Number of 1 Bits](Problems/0191.cpp) |

@@ -1014,6 +1018,7 @@ for solving problems. | 2683 | Medium | [Neighboring Bitwise XOR](Problems/2683.cpp) | | 2685 | Medium | [Count the Number of Complete Components](Problems/2685.cpp) | | 2698 | Medium | [Find the Punishment Number of an Integer](Problems/2698.cpp) |

| 2706 | Easy | [Buy Two Chocolates](Problems/2706.cpp) |

| 2707 | Medium | [Extra Characters in a String](Problems/2707.cpp) | | 2711 | Medium | [Difference of Number of Distinct Values on Diagonals](Problems/2711.cpp) | | 2740 | Medium | [Find the Value of the Partition](Problems/2740.cpp) |