HDU 4069 Squiggly Sudoku(DLX)(The 36th ACM/ICPC Asia Regional Fuzhou Site —— Online Contest)
题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4069 Problem Description Today we play a squiggly
sudoku, The objective is to fill a 9*9 grid with digits so that each column, each row, and ea