题解 | 字符串操作
字符串操作
https://www.nowcoder.com/practice/06a5336b64e3481fbbcc1f7d5cba548d
import sys
import re
n = 0
m = 0
st = ''
for line in sys.stdin:
a = line.split()
if n ==0:
n = int(a[0])
m = int(a[1])
continue
if st=='':
st = a[0]
continue
l,r,c1,c2 = int(a[0]),int(a[1]),a[2],a[3]
st = st[:l-1] + st[l-1:r].replace(c1,c2) + st[r:]
print(st)
