运行 ID: 121195

Main.cc: In function ‘int main()’:
Main.cc:17:4: error: ‘maxn’ was not declared in this scope
    maxn=max(maxn,a[i+j-1]);
    ^~~~
Main.cc:17:4: note: suggested alternative: ‘main’
    maxn=max(maxn,a[i+j-1]);
    ^~~~
    main
Main.cc:19:9: error: ‘maxn’ was not declared in this scope
   cout<