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P10845.cpp
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P10845.cpp
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#include <iostream>
#include <queue>
#include <string>
#include <unordered_map>
int main() {
std::ios_base::sync_with_stdio(false);
std::cin.tie(nullptr);
int n;
std::cin >> n;
std::queue<int> queue;
for (int i = 0; i < n; ++i) {
std::string command;
std::cin >> command;
static const std::unordered_map<std::string, int> table = {
{ "push", 0 },
{ "pop", 1 },
{ "size", 2 },
{ "empty", 3 },
{ "front", 4 },
{ "back", 5 },
};
switch (table.at(command)) {
case 0: {
int value;
std::cin >> value;
queue.push(value);
break;
}
case 1:
if (queue.empty()) {
std::cout << "-1\n";
} else {
std::cout << queue.front() << '\n';
queue.pop();
}
break;
case 2:
std::cout << queue.size() << '\n';
break;
case 3:
std::cout << queue.empty() << '\n';
break;
case 4:
if (queue.empty()) {
std::cout << "-1\n";
} else {
std::cout << queue.front() << '\n';
}
break;
case 5:
if (queue.empty()) {
std::cout << "-1\n";
} else {
std::cout << queue.back() << '\n';
}
break;
}
}
}