纪念一下,第一次AK(老虎集团)
第一题
# # 按频率高低打印 # @param s string字符串 输入字符 # @return string字符串 # import collections class Solution: def frequencySort(self, s): # write code here a = collections.Counter(s) a = dict(a) b = sorted(a.items(), key=lambda a: a[1], reverse=True) ans = "" for i in b: ans += i[0] * i[1] return ans第二题
#
# 路径总和最小
# @param arr int整型二维数组 入参
# @return int整型
#
class Solution:
def uniquePaths(self, arr):
# write code here
m = len(arr) # 行
n = len(arr[0]) # 列
dp = [[float('inf')] * n for _ in range(m)]
dp[0][0] = arr[0][0]
for i in range(1, m):
dp[i][0] = arr[i][0] + dp[i - 1][0]
for i in range(1, n):
dp[0][i] = arr[0][i] + dp[0][i-1]
for i in range(1, m):
for j in range(1, n):
dp[i][j] = min(dp[i - 1][j], dp[i][j - 1]) + arr[i][j]
return dp[-1][-1] 
