HDU step by step

section 1 不解释~

section 2

1.2.1 a+b coming

 1 #include<stdio.h>
 2 long long z,x,y;
 3 int main( )
 4 {
 5     while( scanf( "%I64x%I64x",&x,&y ) != EOF )
 6     {
 7            z = x + y;
 8            if( z < 0 )
 9                printf( "-" ), z = -z;
10            printf( "%d\n",z );
11            }
12     return 0;
13 }

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