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LeetCode "First Missing Positive"
Similar with "Longest Consecutive Sequence". Another usage to hashset.
Take care of corner cases!
class Solution {public: int firstMissingPositive(int A[], int n) { if (n == 0) return 1; unordered_set<int> set; int minPos = std::numeric_limits<int>::max(); for (int i = 0; i < n; i ++) { int n = A[i]; if (n >= 0) { set.insert(n); minPos = std::min(minPos, n); } } if (minPos > 1) return 1; int p = std::numeric_limits<int>::max(); if (set.size() == 0) return 1; for (int i = 0; i < n; i++) { int n = A[i]; if (n < 0) continue; int n1 = n - 1; int n2 = n + 1; if (n1 > 0) { if (set.find(n1) == set.end()) p = std::min(p, n1); } if (n2 > 0) { if (set.find(n2) == set.end()) p = std::min(p, n2); } } return p; }};
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