题解 | #字符串操作#
字符串操作
http://www.nowcoder.com/practice/06a5336b64e3481fbbcc1f7d5cba548d
抄作业,稍有改动
n,m =map(int,input().split())
str1 =[i for i in input()]
for i in range(m):
l,r,ch1,ch2 = input().split()
for j in range(int(l)-1,int(r)):
if str1[j]==ch1:
str1[j] = ch2
print("".join(str1))
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