题解 | 字符串操作
字符串操作
https://www.nowcoder.com/practice/06a5336b64e3481fbbcc1f7d5cba548d
n, m = map(int,input().split())
s = input()
for _ in range(m):
l, r, c1, c2 = input().split()
s = s[:int(l)-1]+s[int(l)-1:int(r)].replace(c1,c2)+s[int(r):]#切片替换与拼接
print(s)
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