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Commit a064222

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solved 2121. Intervals Between Identical Elements
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  • LeetCode/2121._Intervals_Between_Identical_Elements

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#include <bits/stdc++.h>
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#include <gtest/gtest.h>
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#include <unordered_map>
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using namespace std;
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//// START
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/*
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## 2121. Intervals Between Identical Elements
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*/
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class Solution {
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public:
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vector<long long> getDistances(vector<int> &arr) {
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unordered_map<int, vector<int>> mm;
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for (int i = 0; i < arr.size(); i++) {
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mm[arr[i]].push_back(i);
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}
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vector<long long> rets(arr.size());
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for (auto m : mm) {
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vector<long long> leftsum(m.second.size());
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int count = 1;
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for (int i = 1; i < m.second.size(); i++) {
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int delta = m.second[i] - m.second[i - 1];
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leftsum[i] = leftsum[i - 1] + count * delta;
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count++;
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}
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rets[m.second.back()] = leftsum.back();
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vector<long long> rightsum(m.second.size());
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count = 1;
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for (int i = m.second.size() - 2; i >= 0; i--) {
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int delta = m.second[i + 1] - m.second[i];
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rightsum[i] = rightsum[i + 1] + count * delta;
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count++;
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rets[m.second[i]] = leftsum[i] + rightsum[i];
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}
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}
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return rets;
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}
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};
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//// END
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struct T {};
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TEST(Solution, test) {
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T ts[] = {
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{
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},
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{
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},
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};
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for (T t : ts) {
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Solution solution;
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}
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}
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int main() {
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testing::InitGoogleTest();
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return RUN_ALL_TESTS();
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}

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