32 lines
639 B
Java
32 lines
639 B
Java
import java.util.Scanner;
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public class Main
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{
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public static void main(String [] args)
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{
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int T,n,a,b;
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int max,temp;
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Scanner in =new Scanner(System.in);
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T=in.nextInt();
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while(T!=0)
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{
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max=0;
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temp=0;
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n=in.nextInt();
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while(n!=0)
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{
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a=in.nextInt();
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b=in.nextInt();
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temp=temp-a+b;
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if(max<temp)
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max=temp;
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n--;
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}
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System.out.println(max);
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System.out.println();
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T--;
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}
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}
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}
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