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LostBracket.java
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LostBracket.java
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package greedy;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
public class LostBracket {
public static void main(String[] args) throws Exception {
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String input = br.readLine();
int total = 0;
String operand = "";
boolean isMinus = false;
for (int i = 0; i < input.length(); i++) {
char ch = input.charAt(i);
int number;
switch(ch){
case '+':
case '-':
number = Integer.parseInt(operand);
if(isMinus)
total -= number;
else
total += number;
operand = "";
break;
default:
operand += ch;
}
if(ch == '-')
isMinus = true;
}
int number = Integer.parseInt(operand);
if(isMinus)
total -= number;
else
total += number;
bw.write(total + "\n");
bw.flush();
}
}