Look up the tax rate for a region
A billing system stores tax rates by region code. Look up the rate; an unknown region is not taxed.
- Rates are stored as integer percentages in minor units.
- A region not present in the map returns 0.
regionTax(regionRates: map<string, int>, region: string) → int
C++ needs a compiler and Drill does not host one yet, so this page is the reference rather than an exercise: the problem, worked examples, and the solution in full. To type it out, the same problem runs in Python.
Where you start
int regionTax(std::map<std::string, int> regionRates, std::string region) {
}Worked examples
| Call | Result |
|---|---|
regionTax(std::map<std::string, int>{{std::string("US"), 700}, {std::string("EU"), 1900}, {std::string("TR"), 1800}}, std::string("EU")) | 1900 |
regionTax(std::map<std::string, int>{{std::string("US"), 700}}, std::string("UK")) | 0 |
regionTax(std::map<std::string, int>{}, std::string("US")) | 0 |
regionTax(std::map<std::string, int>{{std::string("DE"), 1900}, {std::string("FR"), 2000}}, std::string("DE")) | 1900 |
Hint
Map lookup with a default.
Reference solution in C++
int regionTax(std::map<std::string, int> regionRates, std::string region) {
auto it = regionRates.find(region);
return it == regionRates.end() ? 0 : it->second;
}