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#include <string>
#include <iostream>
#include <sstream>
long strtolong(const std::string& str) {
std::istringstream stream (str);
long i = 0;
stream >> i;
return i;
}
int64_t strtolonglong(const std::string& str) {
std::istringstream stream (str);
int64_t i = 0;
stream >> i;
return i;
}
std::string inttostr(const int i) {
std::string str;
std::stringstream out;
out << i;
str = out.str();
return str;
}
std::string hex_decode(const std::string &in) {
std::string out;
out.reserve(20);
unsigned int in_length = in.length();
for (unsigned int i = 0; i < in_length; i++) {
unsigned char x = '0';
if (in[i] == '%' && (i + 2) < in_length) {
i++;
if (in[i] >= 'a' && in[i] <= 'f') {
x = static_cast<unsigned char>((in[i]-87) << 4);
} else if (in[i] >= 'A' && in[i] <= 'F') {
x = static_cast<unsigned char>((in[i]-55) << 4);
} else if (in[i] >= '0' && in[i] <= '9') {
x = static_cast<unsigned char>((in[i]-48) << 4);
}
i++;
if (in[i] >= 'a' && in[i] <= 'f') {
x += static_cast<unsigned char>(in[i]-87);
} else if (in[i] >= 'A' && in[i] <= 'F') {
x += static_cast<unsigned char>(in[i]-55);
} else if (in[i] >= '0' && in[i] <= '9') {
x += static_cast<unsigned char>(in[i]-48);
}
} else {
x = in[i];
}
out.push_back(x);
}
return out;
}
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