CPP
cpp
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//input expression like : 965194561616165-65162132162165465165+51616461516546512-99
#include <iostream>
#include <regex>
#include <string>
std::string result;
inline std::string find_sum(char a, char b) {
return std::to_string(a + b - 2 * '0');
}
inline char find_sub(char a, char b) {
return char(a - b + '0');
}
void add_one(std::string& s, int len) {
if (s[len] == '9') {
if (len - 1 != -1) {
s[len] = '0';
add_one(s, len - 1);
}
else
s = "1" + s;
}
else
s[len]++;
}
void take_borrow(std::string& s, int len) {
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