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cpp-maps.cpp
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cpp-maps.cpp
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#include <iostream>
#include <vector>
#include <string>
#include <map>
#include <numeric>
int main()
{
auto grades = std::map<std::string, std::vector<unsigned>>{};
auto query_type = unsigned{};
auto grade = unsigned{};
auto name = std::string{};
auto numer_of_queries = unsigned{};
std::cin >> numer_of_queries;
enum class QueryType {
AddMarks = 1,
EraseMarks,
Print
};
for (auto i = unsigned{0}; i < numer_of_queries; i++) {
std::cin >> query_type >> name;
switch(static_cast<QueryType>(query_type)){
case QueryType::AddMarks:
std::cin >> grade;
if (auto [element, success] = grades.insert({name, {grade}}); success == false) {
grades[name].push_back(grade);
}
break;
case QueryType::EraseMarks: grades.erase(name); break;
case QueryType::Print:
std::cout << (grades.find(name) == grades.end() ? 0 : std::accumulate(grades[name].begin(),
grades[name].end(),
unsigned{0})) << '\n';
break;
}
}
return 0;
}