Nov 7

codeforces 255D

Nov 5

codeforces 254E

Nov 5

codeforces 254D

Nov 5

codeforces 254C

Nov 5

codeforces 254B

Nov 5

codeforces 254A

Oct 7

uva 1121

Oct 7

uva 10881

Oct 2

矩阵十题

Oct 2

poj 2778