Harry93 2012-01-14 05:58:00
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#include <stdio.h>
main()
{
int i,j=0,k,t;
int road[10001],L,M,b,e;
scanf( "%d %d", &L, &M );
for( i=1; i<=L; i++ )
road[i]= 1;
for( i=1; i<=M; i++ )
{
scanf( "%d %d", &b, &e );
for( k=b; k<=e; k++ )
road[k]= 0;
}
for( i=1; i<=L; i++ )
if( road[i] == 1 ) j++;
printf("%d",j+1);
return 0;
}