Codeforces Round #684 (Div. 2)

A - Buy the String 要麼全變成1要麼全變成0要麼一個都不改變，三種狀況取最小。html #define IO ios::sync_with_stdio(false);cin.tie();cout.tie(0) #pragma GCC optimize(2) #include<set> #include<map> #include<cmath> #include<stack> #i

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