宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">，求</font></span><span lang="EN-US"><span style="position: relative; top: 3pt; mso-text-raise: -3.0pt">S</span></span><span style="font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">的最大子串能表示成</font></span><span lang="EN-US"><span style="position: relative; top: 3pt; mso-text-raise: -3.0pt">WW<sup>R</sup>WW</span><