0幸运数 - 蓝桥云课 (lanqiao.cn)

res=0
for i in range (1,100000000):l_n=[]for j in str(i):l_n.append(int(j))if len(l_n) % 2 ==0:cur =len(l_n)>>1if sum(l_n[:cur])==sum(l_n[cur:]):res+=1
print(res)

 0有奖问答 - 蓝桥云课 (lanqiao.cn)

dfs

def bfs(score, qus):global resif qus>=31 or score==100:returnif score == 70:res+=1bfs(score + 10, qus + 1)bfs(0, qus + 1)res=0
bfs(0, 0)
print(res)

 dp

 

dp=list([0]*10 for _ in range (31))dp[0][0]=1
for i in ran