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Educational Codeforces Round 92 (Rated for Div. 2) C - Good String (思惟)
時間 2020-08-04
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題目傳送 題意: 給你一個字符串,如今有倆種操做,一種是字符串全部位都向左平移一個單位,另外一種是向右平移一個單位,如今要使得這個字符串倆種操做後的字符串仍是相等的,問最少改動多少個字符?ios 思路: 既然要平移後的字符串仍是徹底相等的,那麼能夠獲得: s[i-1] == s[i+1] (向右平移的和向左平移的),那麼再推一下就能夠獲得只有倆種字符串是能夠的: 1111111 或者 252525
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