結果
| 問題 | 
                            No.954 Result
                             | 
                    
| コンテスト | |
| ユーザー | 
                             lam6er
                         | 
                    
| 提出日時 | 2025-03-20 21:11:44 | 
| 言語 | PyPy3  (7.3.15)  | 
                    
| 結果 | 
                             
                                AC
                                 
                             
                            
                         | 
                    
| 実行時間 | 40 ms / 2,000 ms | 
| コード長 | 1,417 bytes | 
| コンパイル時間 | 189 ms | 
| コンパイル使用メモリ | 82,372 KB | 
| 実行使用メモリ | 54,056 KB | 
| 最終ジャッジ日時 | 2025-03-20 21:12:39 | 
| 合計ジャッジ時間 | 2,830 ms | 
| 
                            ジャッジサーバーID (参考情報)  | 
                        judge1 / judge2 | 
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| ファイルパターン | 結果 | 
|---|---|
| sample | AC * 7 | 
| other | AC * 29 | 
ソースコード
# Generate the Fibonacci list up to a sufficiently large number
fib = [1, 1]
while True:
    next_val = fib[-1] + fib[-2]
    fib.append(next_val)
    if next_val > 10**18:
        break
# Read input and reverse it to process from the bottom up
s = [int(input()) for _ in range(5)][::-1]
max_n = 0
# Check from n=5 down to n=1
for n in range(5, 0, -1):
    sub = s[:n]
    
    # Check non-decreasing
    valid_non_decreasing = True
    for i in range(len(sub) - 1):
        if sub[i] > sub[i + 1]:
            valid_non_decreasing = False
            break
    if not valid_non_decreasing:
        continue
    
    # Check Fibonacci conditions
    if len(sub) == 1:
        # Check if the single element is a Fibonacci number
        if sub[0] in fib:
            max_n = n
            break
    else:
        a, b = sub[0], sub[1]
        # Check if a and b are consecutive Fibonacci numbers
        found = False
        for i in range(len(fib) - 1):
            if fib[i] == a and fib[i + 1] == b:
                found = True
                break
        if not found:
            continue
        
        # Check subsequent elements follow the Fibonacci rule
        valid_rest = True
        for i in range(2, len(sub)):
            if sub[i] != sub[i - 1] + sub[i - 2]:
                valid_rest = False
                break
        if valid_rest:
            max_n = n
            break
print(max_n)
            
            
            
        
            
lam6er