1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | static auto x = []() { ios::sync_with_stdio(false); cin.tie(nullptr); return 0; }(); class Solution { public: int maximum69Number (int num) { stack<int> s; int now=num; while(now!=0){ s.push(now%10); now/=10; } bool changed=false; int ret=0; while(!s.empty()){ if(changed){ ret=ret*10+s.top(); s.pop(); } else{ if(s.top()==6){ changed=true; } ret=ret*10+9; s.pop(); } } return ret; } }; |
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