After defeating the Anti-Addition Beast, Feiyu encountered the Anti-Subtraction Beast!
After he thought it was just the Anti-Subtraction Beast, the Anti-Addition Beast also appeared!
Sample Inputs/Outputs
| Sample Input(s) | Sample Output(s) |
|---|---|
| The first line is the number of test cases. The first line of each test case indicates whether it's a positive (+) or negative (-) test case. The second line of each test case is an arithmetic expression. For example: 9+9, 5-3, 2-9 | Output the results of the calculations. |
| 3 – 6-5 + 6+7 – 0-3 | 1 13 -3 |
Thought Process
Use a string to store the arithmetic expression. Run a for loop over the characters of the string. Declare an empty string and append each character to it during each iteration. If the current character is "+" or "-", convert the accumulated string and the substring starting from the current position + 1 to integers, and perform an addition or subtraction operation. Finally, output the result of the operation.
Sample Code－ZeroJudge K680: Adding and Subtracting Numbers
#include <iostream>
using namespace std;
int toint(string str)
{
if (str.length() == 1) return int(str[0] - '0');
return stoi(str);
}
int main() {
cin.sync_with_stdio(0);
cin.tie(0);
int N;
cin >> N;
for (int i = 0; i<N; i++)
{
char op;
cin >> op;
string str, tmp = "";
cin >> str;
int ans = 0;
for (int j = 0; j<str.length(); j++)
{
if (str[j] == op)
{
ans += toint(tmp);
if (op == '+') ans += toint(str.substr(j+1, str.length()));
else ans -= toint(str.substr(j+1, str.length()));
break;
}
tmp += str[j];
}
cout << ans << "\n";
}
}
//ZeroJudge K680
//Dr. SeanXD