用隐枚举法求解下列0-1规划问题: (1)min x 0 =2x 1 +5x 2 +3x 3 +4x 4 , s.t.-4x 1 +x 2 +x 3 +x 4 ≥0, -2x 1 +4x 2 +2x 3 +4x 4 ≥4, x 1 +x 2 -x 3 +x 4 ≥1, x j =0或1 (j=1,2,3,4); (2)max z=2x 1 -x 2 +5x 3 -3x 4 +4x 5 , s.t.3x 1 -2x 2 +7x 3 -5x 4 +4x 5 ≤6, x 1 -x 2 +2x 3 -4x 4 +2x 5 ≤0, x j =0或1(j=1,2,…,5).