Commit 694a277

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	`1`	`+class Solution {`
	`2`	`+public:`
	`3`	`+ string robotWithString(string s) {`
	`4`	`+ vector<int> f(26);`
	`5`	`+ for (auto& i : s) f[i - 'a']++;`
	`6`	`+ stack<char> stk;`
	`7`	`+ string ans;`
	`8`	`+ for (auto& i : s) {`
	`9`	`+ f[i - 'a']--;`
	`10`	`+ stk.push(i);`
	`11`	`+ while (!stk.empty()) {`
	`12`	`+ bool ok = true;`
	`13`	`+ for (int j = 0; j < stk.top() - 'a'; j++) {`
	`14`	`+ if (f[j]) ok = false;`
	`15`	`+ }`
	`16`	`+ if (!ok) break;`
	`17`	`+ ans += stk.top();`
	`18`	`+ stk.pop();`
	`19`	`+ }`
	`20`	`+ }`
	`21`	`+ return ans;`
	`22`	`+ }`
	`23`	`+};`

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