***Leetcode 316. Remove Duplicate Letters
不是很容易想。
如果來了一個新的字母 就考慮放在哪個位置合適,之前已經選的字母 如果後面還有,就可以暫時刪除。
class Solution { public: string removeDuplicateLetters(string s) { int visit[256] = {0}; int mem[256] = {0}; string ret = "0"; for (auto c : s) mem[c] ++; for (auto c : s) { mem[c]--; if (visit[c])continue; while (c < ret.back() && mem[ret.back()] ) { visit[ret.back()] = 0; ret.pop_back(); } visit[c] = 1; ret += c; } return ret.substr(1); } };
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***Leetcode 316. Remove Duplicate Letters
不是很容易想。 如果來了一個新的字母 就考慮放在哪個位置合適,之前已經選的字母 如果後面還有,就可以暫時刪除。 class Solution { public: string removeDuplicateLetters(string s) {
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