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1357 - Plus Minus
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==Rezolvare== <syntaxhighlight lang="python3" line="1"> def solve_plus_minus(n, signs, current_sum, current_expression, result): if len(current_expression) == n: if current_sum == 0: result.append(" ".join(current_expression)) return for sign in signs: new_sum = current_sum + sign * (current_expression[-1] + 1) ** 2 if new_sum <= n: solve_plus_minus(n, signs, new_sum, current_expression + [sign], result) def plus_minus(n): signs = [-1, 1] # -1 pentru minus, 1 pentru plus result = [] # Inițial, începem cu primul termen, care este întotdeauna un plus solve_plus_minus(n, signs, 1, [1], result) if not result: result.append("IMPOSIBIL") return result Citim input-ul with open("plusminus.in", "r") as f: n = int(f.readline().strip()) Calculăm rezultatul result = plus_minus(n) Scriem rezultatul în fișierul de ieșire with open("plusminus.out", "w") as f: for line in result: f.write(line + "\n") </syntaxhighlight>
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