백준 1669 멍멍이 쓰다듬기(실패)

https://www.acmicpc.net/problem/1669

1669번: 멍멍이 쓰다듬기

X,Y=map(int, input().split())

xy = Y-X-1
i=0
if(xy==-1):
    num=0
if(xy==0):
    num=1

else:
    while(1):
        if(xy<=0):
            break
        xy-=i
        i+=1
    num=i
print(num)

X,Y=map(int, input().split())

xy = Y-X
num=0
if(xy==0):
    num=0
elif(xy==1):
    num=1
else:
    cnt=0
    j=0
    for i in range(xy):
        if (j**2 == i or j**2+j==i):
            num+=1
            cnt+=1
            if cnt%2!=0:
                j+=1
                   
print(num)
# cnt=1
# for i in range(num):    
#     for j in range(cnt,cnt+i):
#         cnt+=1
# print(i+1)