运行 ID: 121196

Main.cc: In function ‘int main()’:
Main.cc:17:12: error: ‘maxn’ was not declared in this scope
    byd=max(maxn,a[i+j-1]);
            ^~~~
Main.cc:17:12: note: suggested alternative: ‘main’
    byd=max(maxn,a[i+j-1]);
            ^~~~
            main