foo.cc: In function 'int main()':
foo.cc:11:25: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[100]' [-Wformat=]
         scanf("%s",&a[i]);//输入数据
                    ~~~~~^
foo.cc:9:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&n,&m);//分别表示雷区的行数和列数
     ~~~~~^~~~~~~~~~~~~~~
foo.cc:11:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%s",&a[i]);//输入数据
         ~~~~~^~~~~~~~~~~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。