yukicoder contest 288 参戦記 - Qiita

from sys import stdin from heapq import heapify, heappop, heappush readline = stdin.readline N = int(readline()) S = list(readline()[:-1]) T = list(readline()[:-1]) Q = int(readline()) s = set() q = [] for i in range(N): if S[i] == T[i]: continue q.append(i) s.add(i) heapify(q) result = [] for _ in range(Q): c, x, y = readline().split() x = int(x) - 1 is_same = S[x] == T[x] if c == 'S': S[x] = y e