Runtime Error, quite simple code

  • 0
    class Solution {
        int maximumGap(vector<int> &num) {
            if (num.size()<2) return 0;
            int maxEle = *(std::max_element(num.begin(),num.end())),minEle = *(std::min_element(num.begin(),num.end())), size=(int)num.size(), bktSize = (maxEle-minEle)/(size-1);
            vector<int> nullVec;
            vector<vector<int>> bucket(size,nullVec);
            for (int i=0;i<size;i++){
            int maxGap = 0;
            for (int i=0,j=1;j<size;){
                if (bucket[j].size()==0) j++;
                    int small = *(std::max_element(bucket[i].begin(),bucket[i].end()));
                    int large = *(std::min_element(bucket[j].begin(),bucket[j].end()));
                    if ((large-small)>maxGap) maxGap = large-small;
                    i = j++;
            return maxGap;

    It gets runtime error with test case {3,6,1,9}. Any idea?
    ps. I can get correct answer without warning in IDE by this code.

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