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3058 - vip
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= Exemplul 1: = <code>vipIN.txt</code> 2 8 6 corleone vasilica 5 2 marko ghita <code>vipOUT.txt</code> caaliisv -1 === Explicație: === În primul set cea mai mică anagramă a șirului <code>vasilica</code>, din punct de vedere lexicografic, care diferă de șirul <code>corleone</code> pe exact <code>6</code> poziții, este <code>caaliisv</code> În al doilea set nici una din anagramele șirului <code>ghita</code> nu poate să difere pe exact două poziții de șirul <code>marko</code>. == Exemplul 2: == <code>vipIN.txt</code> 2 80000000000 6 corleone vasilica 5 2 marko ghita <code>vipOUT.txt</code> Datele nu corespund restrictiilor impuse == Rezolvare == <syntaxhighlight lang="python3" line="1"> def citeste_intrare(nume_fisier): with open(nume_fisier, 'r') as f: t = int(f.readline().strip()) cazuri = [] for _ in range(t): n, k = map(int, f.readline().strip().split()) s1 = f.readline().strip() s2 = f.readline().strip() cazuri.append((n, k, s1, s2)) return cazuri def verifica_invariant(freq1, freq2, egali, diferiti, sigma=26): nevoie_extra_op = 0 max_extra = 0 for i in range(1, sigma + 1): extra_car = freq1[i] + freq2[i] - diferiti extra_op = (extra_car + 1) // 2 if extra_op > min(freq1[i], freq2[i]): return False max_extra += min(freq1[i], freq2[i]) if extra_op > 0: nevoie_extra_op += extra_op return nevoie_extra_op <= egali and egali <= max_extra def rezolva_caz(n, k, s1, s2): freq1 = [0] * 27 freq2 = [0] * 27 answer = [''] * (n + 1) for char in s1: freq1[ord(char) - ord('a') + 1] += 1 for char in s2: freq2[ord(char) - ord('a') + 1] += 1 egali = n - k diferiti = k if not verifica_invariant(freq1, freq2, egali, diferiti): return "-1" for i in range(1, n + 1): freq1[ord(s1[i-1]) - ord('a') + 1] -= 1 for j in range(1, 27): if freq2[j] == 0: continue freq2[j] -= 1 if ord(s1[i-1]) - ord('a') + 1 == j: egali -= 1 else: diferiti -= 1 if verifica_invariant(freq1, freq2, egali, diferiti): answer[i] = chr(j + ord('a') - 1) break if ord(s1[i-1]) - ord('a') + 1 == j: egali += 1 else: diferiti += 1 freq2[j] += 1 return ''.join(answer[1:]) def scrie_iesire(nume_fisier, rezultate): with open(nume_fisier, 'w') as f: for rez in rezultate: f.write(f"{rez}\n") def verifica_restricții(cazuri, nume_fisier_iesire): suma_n = sum(caz[0] for caz in cazuri) # Suma tuturor valorilor lui N if not all(1 <= caz[0] <= 100000 and 1 <= caz[1] <= 100000 for caz in cazuri) or suma_n > 1000000: with open(nume_fisier_iesire, 'w') as f: f.write("Datele nu corespund restrictiilor impuse\n") return False return True def main(): cazuri = citeste_intrare("vipIN.txt") if not verifica_restricții(cazuri, "vipOUT.txt"): return # Oprește execuția dacă datele nu corespund restricțiilor rezultate = [] for caz in cazuri: rezultate.append(rezolva_caz(*caz)) scrie_iesire("vipOUT.txt", rezultate) if __name__ == "__main__": main() </syntaxhighlight>
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