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divide.cpp
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divide.cpp
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#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <string>
#include <unordered_map>
using namespace std;
string Divide(int a, int b) {
string integer = "";
string decimal = "";
string sign = "";
int cnt = 0;
if (b == 0) return "";
if (a == 0) return "0";
if (a > 0 && b > 0 || a < 0 && b < 0) {
sign = "";
} else {
sign = "-";
}
a = a > 0?a:-a;
b = b > 0?b:-b;
while (a >= b) {
a -= b;
cnt++;
}
integer.append(to_string(cnt));
int remain = a;
int idx = 0;
unordered_map<int, int> usedNumber;
while (remain != 0) {
remain *= 10;
if (usedNumber.count(remain) > 0) {
decimal.insert(usedNumber[remain], "(");
decimal.push_back(')');
break;
}
usedNumber.insert(make_pair(remain, idx++));
cnt = 0;
while (remain >= b) {
remain -= b;
cnt++;
}
decimal.append(to_string(cnt));
}
return sign+integer+"."+decimal;
}
int main() {
while (1) {
int a;
int b;
cin >> a;
cin >> b;
std::cout << Divide(a, b) << " = " <<double(a) / (double) b << std::endl;
}
}