/in/foo.cc:4:1: error: specializing member 'std::basic_ios<char>::sync_with_stdio' requires 'template<>' syntax
 ios::sync_with_stdio(false);//关闭同步流，使使用流输入输出时不用将流存入缓存再读取，让流的效率接近标准io 
 ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:20:31: warning: left operand of comma operator has no effect [-Wunused-value]
     for(i=1;i<=n-1;i++) a[i+1]>=a[i],d=d+1;//特判:1~3组数据 
                         ~~~~~~^~~~~~