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class Solution { public: string removeKdigits(string num, int k) { string ret = ""; int n = num.size(); if(k == n) return ret; stact<int> S; for(int i = 0; i < n; i++){ int now = num[i] - '0'; while(k and S.top() > now){ k--, S.po(); } if(k == 0){ for(; i < n; i++) } } } };
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