677. Map Sum Pairs

[zwfang]

https://leetcode.com/problems/map-sum-pairs/

Implement a MapSum class with insert, and sum methods.

For the method insert, you'll be given a pair of (string, integer).
The string represents the key and the integer represents the value.
If the key already existed, then the original key-value pair will be overridden to the new one.

For the method sum, you'll be given a string representing the prefix,
and you need to return the sum of all the pairs' value whose key starts with the prefix.

[codecov]

Codecov Report

Merging #75 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
+ Coverage   99.34%   99.35%   +0.01%     
==========================================
  Files         112      113       +1     
  Lines        1951     1972      +21     
==========================================
+ Hits         1938     1959      +21     
  Misses          9        9              
  Partials        4        4

Impacted Files	Coverage Δ
src/0677_map_sum_pairs/map_sum_pairs.go	100% <100%> (ø)
src/0208_implement_trie_prefix_tree/impltrie.go	100% <100%> (ø)	⬆️