2665
2014/02/11
■
java
pku
poj
ひさびさ
自力じゃない....
package p2665;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
do {
int L = scanner.nextInt();
int M = scanner.nextInt();
if (L == 0 && M == 0)
break;
L++;
for (int i = 0; i < M; i++) {
int s = scanner.nextInt();
int e = scanner.nextInt() + 1;
L -= e - s;
}
System.out.println(L);
} while (true);
}
}
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