0_0_4293874_1650.c 0_0_4293874_1650.c(4) : error C2061: 语法错误 : 标识符“dfs” 0_0_4293874_1650.c(4) : error C2059: 语法错误 : “;” 0_0_4293874_1650.c(4) : error C2059: 语法错误 : “类型”