結果
| 問題 |
No.2069 み世界数式
|
| ユーザー |
gew1fw
|
| 提出日時 | 2025-06-12 18:46:17 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 3,401 bytes |
| コンパイル時間 | 239 ms |
| コンパイル使用メモリ | 82,560 KB |
| 実行使用メモリ | 103,408 KB |
| 最終ジャッジ日時 | 2025-06-12 18:46:22 |
| 合計ジャッジ時間 | 5,113 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 8 TLE * 1 -- * 32 |
ソースコード
import sys
from itertools import product
def tokenize(expr):
tokens = []
i = 0
while i < len(expr):
if expr[i] in '()+-*/$&':
tokens.append(expr[i])
i += 1
elif expr[i].isdigit():
num = 0
while i < len(expr) and expr[i].isdigit():
num = num * 10 + int(expr[i])
i += 1
tokens.append(str(num))
else:
i += 1
return tokens
def infix_to_postfix(tokens):
precedence = {'+':1, '-':1, '*':2, '/':2}
output = []
stack = []
for token in tokens:
if token.isdigit():
output.append(token)
elif token == '(':
stack.append(token)
elif token == ')':
while stack and stack[-1] != '(':
output.append(stack.pop())
stack.pop() # 移除 '('
elif token in precedence:
while stack and stack[-1] != '(' and precedence[token] <= precedence.get(stack[-1], 0):
output.append(stack.pop())
stack.append(token)
while stack:
output.append(stack.pop())
return output
def evaluate_postfix(postfix, M, ans):
try:
stack = []
for token in postfix:
if token.isdigit():
stack.append(int(token))
else:
if len(stack) < 2:
return False, None
b = stack.pop()
a = stack.pop()
if token == '+':
res = a + b
elif token == '-':
res = a - b
if res < 0:
return False, None
elif token == '*':
res = a * b
elif token == '/':
if b == 0:
return False, None
res = a // b
else:
return False, None
if res < 0 or res > M:
return False, None
stack.append(res)
if len(stack) != 1:
return False, None
final = stack[0]
return final == ans, final
except:
return False, None
def main():
import sys
input = sys.stdin.read().splitlines()
M, ans = map(int, input[0].split())
expr = input[1].strip()
dollar_indices = [i for i, c in enumerate(expr) if c == '$']
amp_indices = [i for i, c in enumerate(expr) if c == '&']
replacement_options = []
for i in range(len(dollar_indices)):
replacement_options.append(['+', '-'])
for i in range(len(amp_indices)):
replacement_options.append(['*', '/'])
for replacement in product(*replacement_options):
expr_list = list(expr)
dollar_idx = 0
amp_idx = 0
for i, c in enumerate(expr_list):
if c == '$':
expr_list[i] = replacement[dollar_idx]
dollar_idx += 1
elif c == '&':
expr_list[i] = replacement[amp_idx + len(dollar_indices)]
amp_idx += 1
new_expr = ''.join(expr_list)
tokens = tokenize(new_expr)
postfix = infix_to_postfix(tokens)
success, final = evaluate_postfix(postfix, M, ans)
if success:
print(new_expr)
return
print(-1)
if __name__ == "__main__":
main()
gew1fw