题解 | #字符串操作#
字符串操作
http://www.nowcoder.com/questionTerminal/06a5336b64e3481fbbcc1f7d5cba548d
卡了一下输入，其他就是常规写法
n,m = map(int, input().split())
s = input()
ss = []
for i in s:
ss.append(i)
for i in range(m):
l,r,ch1,ch2 = input().split()
#l,r = map(int, input().split())
#ch1,ch2 = map(str,input().split())
for j in range(int(l)-1,int(r)):
if ss[j] == ch1:
ss[j] = ch2
print(''.join(ss))
