i changed my algorithm from checking cases to searching with memorizing, but always get wa on test 7. after one day's struggle, i'm nearly crazy... at last i found my reading part has a mistake that i read the data like this:
scanf("%s", tmp);
p[0] = tmp[0] - 'a';
p[1] = tmp[1] - '1';
but when N is greater than 9, p[1] may have 2 digits...... i hope no one will make SUCH a SILLY mistake like me, especially spending one day on it...

Edited by author 12.09.2007 08:15