s : 116A - Tram

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コード#コード#

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class A_Tram {
	
	static int size;
	static BufferedReader br;
	
	static int toInt(String msg) {
		return Integer.parseInt(msg);
	}
	static int N;
	static StringTokenizer stk;
	static StringTokenizer toToken(String msg) {
		stk = new StringTokenizer(msg);
		return stk;
	}
	static int[][] arr;
	public static void main(String[] args) throws IOException{
		br = new BufferedReader(new InputStreamReader(System.in));
		N = toInt(br.readLine());
		arr = new int[N][2];
		for(int i = 0 ; i < N ; i++) {
			stk = toToken(br.readLine());
			arr[i][0] = toInt(stk.nextToken());
			arr[i][1] = toInt(stk.nextToken());
		}
		int value = 0;
		for(int i = 0; i < N ; i++) {
			
			int out = arr[i][0];
			int in = arr[i][1];
			value = value-out+in;
			size = Math.max(size, value);
		}
		System.out.println(size);
		
	}
}

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