leetcode

Data Structure II: Day 21

3 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/ Problems/0451.cpp b/ Problems/0451.cpp

@@ -0,0 +1,11 @@

class Solution {

public:

string frequencySort(string s) {

array<int, 128> um = {0};

for (char c : s) um[c]++;

sort(s.begin(), s.end(), [&um](char a, char b) {

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

});

return s;

}

};

diff --git a/ Problems/0973.cpp b/ Problems/0973.cpp

@@ -0,0 +1,17 @@

class Solution {

typedef pair<double, int> pdi;

public:

vector<vector<int>> kClosest(vector<vector<int>> &points, int k) {

auto cmp = [](const pdi &a, const pdi &b) { return a.first < b.first; };

priority_queue<pdi, vector<pdi>, decltype(cmp)> pq(cmp);

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

pq.push({sqrt(pow(points[i][0], 2) + pow(points[i][1], 2)), i});

if (pq.size() > k) pq.pop();

}

vector<vector<int>> res(k);

while (k--) res[k] = points[pq.top().second], pq.pop();

return res;

}

};

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

@@ -238,6 +238,7 @@ for solving problems. | 0445 | Medium | [Add Two Numbers II](Problems/0445.cpp) | | 0448 | Easy | [Find All Numbers Disappeared in an Array](Problems/0448.cpp) | | 0450 | Medium | [Delete Node in a BST](Problems/0450.cpp) |

| 0451 | Medium | [Sort Characters By Frequency](Problems/0451.cpp) |

| 0452 | Medium | [Minimum Number of Arrows to Burst Balloons](Problems/0452.cpp) | | 0460 | Hard | [LFU Cache](Problems/0460.cpp) | | 0472 | Hard | [Concatenated Words](Problems/0472.cpp) |

@@ -336,6 +337,7 @@ for solving problems. | 0953 | Easy | [Verifying an Alien Dictionary](Problems/0953.cpp) | | 0959 | Medium | [Regions Cut By Slashes](Problems/0959.cpp) | | 0965 | Easy | [Univalued Binary Tree](Problems/0965.cpp) |

| 0973 | Medium | [K Closest Points to Origin](Problems/0973.cpp) |

| 0974 | Medium | [Subarray Sums Divisible by K](Problems/0974.cpp) | | 0977 | Easy | [Squares of a Sorted Array](Problems/0977.cpp) | | 0980 | Hard | [Unique Paths III](Problems/0980.cpp) |