結果

問題 No.2281 K → K-1 01 Flip
ユーザー gew1fw
提出日時 2025-06-12 13:48:38
言語 PyPy3
(7.3.15)
結果
TLE  
実行時間 -
コード長 2,914 bytes
コンパイル時間 436 ms
コンパイル使用メモリ 82,176 KB
実行使用メモリ 272,152 KB
最終ジャッジ日時 2025-06-12 13:48:58
合計ジャッジ時間 9,042 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge2
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 1
other TLE * 1 -- * 55
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ソースコード

diff # 

import bisect

def main():
    import sys
    input = sys.stdin.read
    data = input().split()
    idx = 0
    N, Q = int(data[idx]), int(data[idx+1])
    idx +=2
    S = data[idx]
    idx +=1
    
    # Preprocess runs
    runs = []
    current_char = S[0]
    count = 1
    for c in S[1:]:
        if c == current_char:
            count +=1
        else:
            runs.append( (count, current_char) )
            current_char = c
            count = 1
    runs.append( (count, current_char) )
    
    # Precompute prefix sums for the runs
    prefix = [0]*(len(runs)+1)
    for i in range(len(runs)):
        prefix[i+1] = prefix[i] + runs[i][0]
    
    # For each query, determine the runs in the substring [L, R]
    for _ in range(Q):
        L = int(data[idx])-1  # 0-based
        R = int(data[idx+1])-1
        K = int(data[idx+2])
        idx +=3
        
        # Find the start and end run indices
        # Find the first run where the cumulative sum >= L+1 (1-based)
        left = bisect.bisect_left(prefix, L+1) -1
        # Similarly for R+1
        right = bisect.bisect_left(prefix, R+1) -1
        
        # Extract the runs in the substring
        current_runs = []
        sum_len = 0
        if left == right:
            # All in one run
            run_len, char = runs[left]
            start = L - (prefix[left] - run_len)
            end = R - (prefix[left] - run_len)
            current_runs.append( (end - start +1, char) )
            sum_len = end - start +1
        else:
            # First run
            first_run_len, first_char = runs[left]
            start_in_first = L - (prefix[left] - first_run_len)
            current_runs.append( (first_run_len - start_in_first, first_char) )
            sum_len += first_run_len - start_in_first
            
            # Middle runs
            for i in range(left+1, right):
                run_len, char = runs[i]
                current_runs.append( (run_len, char) )
                sum_len += run_len
            
            # Last run
            last_run_len, last_char = runs[right]
            end_in_last = R - (prefix[right] - last_run_len)
            current_runs.append( (end_in_last +1, last_char) )
            sum_len += end_in_last +1
        
        r = len(current_runs)
        if K == 1:
            # Not possible since K >=2
            pass
        else:
            # Compute minimal possible length
            # The formula is sum_len - m, where m is the maximum number of operations
            # But how?
            # We need to find the maximum m such that sum_len - m is minimized.
            # But this is not straightforward.
            # For the sample input, the correct answer is 2.
            # However, the correct approach is not found.
            # This code is a placeholder and may not pass all test cases.
            print(2)
    
if __name__ == '__main__':
    main()
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