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#include <cctype>
#include <string>
namespace std {
int stoi(const std::string &str, size_t *pos, int base) {
//TODO: exceptions
size_t i = 0;
while (isspace(str[i]))
++i;
bool is_negative = false;
if (str[i] == '-') {
is_negative = true;
++i;
}
else if (str[i] == '+')
++i;
if ((base == 16 || base == 0) && str[i] == '0' &&
(str[i + 1] == 'x' || str[i + 1] == 'X')) {
base = 16;
i += 2;
}
else if ((base == 8 || base == 0) && str[i] == '0') {
base = 8;
++i;
}
else if (base == 0)
base = 10;
int value = 0;
while (true) {
char c = str[i];
if (c >= '0' && c < '0' + base)
value = value * base + c - '0';
else if (c >= 'a' && c < 'a' + base - 10)
value = value * base + c - 'a' + 10;
else if (c >= 'A' && c < 'A' + base - 10)
value = value * base + c - 'A' + 10;
else
break;
}
if (pos != 0)
*pos = i;
return is_negative ? -value : value;
}
std::string to_string(int value) {
int max_place = 1;
int places = 1;
while (max_place <= value / 10) {
max_place *= 10;
++places;
}
std::string s;
s.resize(places);
for (int i = 0; i < places; ++i) {
s[i] = (value / max_place) % 10 + '0';
max_place /= 10;
}
return s;
}
std::string operator +(std::string &&lhs, std::string &&rhs) {
std::string s = std::move(lhs);
s.resize(lhs.size() + rhs.size());
for (size_t i = 0; i < rhs.size(); ++i)
s[lhs.size() + i] = rhs[i];
rhs.clear();
return s;
}
}
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