0_0_1421839_20029.c 0_0_1421839_20029.c(4) : error C2061: 语法错误 : 标识符“DFS” 0_0_1421839_20029.c(4) : error C2059: 语法错误 : “;” 0_0_1421839_20029.c(4) : error C2059: 语法错误 : “类型”