题目计算矩阵边缘之和答题地址：http//pkuic.openjudge.cn/ziyoulianxi//AecdeefcbadaaaafabBcbdaccacfcbcfabeacfbdcdfCdcebfdaedfcaabfacdfccacbcdeeccbaaaDbebaccadeeffccaecdfabfbcfedEcaadbaafebebfbccebf