[Python] ABC019 B

問題

B – 高橋くんと文字列圧縮

回答

s = input()

s_compressed = ''
cnt = 1

for i, ch in enumerate(s):
    if i == 0:
        ch_pre = ch
        continue
    
    if ch == s[i-1]:
        cnt += 1
    else:
        s_compressed += ch_pre + str(cnt)
        ch_pre = ch
        cnt = 1
        
s_compressed += ch_pre + str(cnt)

print(s_compressed)