leetcode

Solution to some Leetcode problems written in C++
git clone git://git.dimitrijedobrota.com/leetcode.git
Log | Files | Refs | README | LICENSE
commit47acae7b6715ade1a457a2c8c475577bde086911
parent923420a4665307da7fe969fb53eac828621a2da8
authorDimitrije Dobrota <mail@dimitrijedobrota.com>
dateFri, 23 Jun 2023 14:00:25 +0200

Daily Problem

Diffstat:
AProblems/1027.cpp|++++++++++++++++++++++++++++
MREADME.md|+

2 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/Problems/1027.cpp b/Problems/1027.cpp

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

class Solution {
public:
int longestArithSeqLength(vector<int> &nums) {
unordered_map<int, vector<int>> um;
int res = 2;
for (int i = 0; i < nums.size(); i++) um[nums[i]].push_back(i);
for (const auto &[num1, vec1] : um) {
res = max(res, (int)vec1.size());
for (const auto &[num2, vec2] : um) {
if (num1 == num2) continue;
auto it = lower_bound(vec2.begin(), vec2.end(), vec1.front() + 1);
if (it == vec2.end()) continue;
int diff = num2 - num1, crnt = *it, count = 2, next;
while (true) {
if (!um.count(next = nums[crnt] + diff)) break;
auto it = lower_bound(um[next].begin(), um[next].end(), crnt + 1);
if (it == um[next].end()) break;
crnt = *it, count++;
}
res = max(res, count);
}
}
return res;
}
};

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

@@ -406,6 +406,7 @@ for solving problems.

| 1020 | Medium | [Number of Enclaves](Problems/1020.cpp) |
| 1022 | Easy | [Sum of Root To Leaf Binary Numbers](Problems/1022.cpp) |
| 1026 | Medium | [Maximum Difference Between Node and Ancestor](Problems/1026.cpp) |
| 1027 | Medium | [Longest Arithmetic Subsequence](Problems/1027.cpp) |
| 1035 | Medium | [Uncrossed Lines](Problems/1035.cpp) |
| 1038 | Medium | [Binary Search Tree to Greater Sum Tree](Problems/1038.cpp) |
| 1042 | Medium | [Flower Planting With No Adjacent](Problems/1042.cpp) |