[Collection] compilation errors

// the record about their own convenience troubleshooting qwq

 

1.  name lookup of '变量名' changed [enabled by default]3.

[ If nested local variable with the same name in the local scope will appear this error, which means that there has been redefined ]

2.reference to "xx" is ambiguous

[ Variable names defined function name may be a function library ]

[A] chestnuts

 1
  //印象这鬼一样的排版emmmm
 #include<bits/stdc++.h>
 2 using namespace std;
 3 int a[1000];
 4 int root,maxroot,n,m,x,y,MAX,sum;
 5 int main()
 6 {
 7   ios::sync_with_stdio(false);
 8   cin>>n>>m;
 9   for(int i=1;i<=m;i++)
10   {
11     cin>>x>>y;
12     a[y]=x;
13   }
14   for(int i=1;i<=n;i++)
15   {
16   if(a[i]==0){root=i;break;
17   }
18    }cout<<root<<endl;
19   for(int i=1;i<=n;i++)
20  {
21    sum=0;
22    for(int j=1;j<=n;j++)
23   {
24    if(a[j]==i)sum++;
25    }
26     IF (SUM> MAX) MAX {= SUM; maxroot = i;     // Police milo is his! max! ** Why max variable when the problem will be the title of it? ** Because the function library contains max function, use it to cause ambiguity Gan ah! 
27     }
 28    } COUT maxroot << << endl;
 29    for ( int I = . 1 ; I <= n-; I ++ )
 30  {
 31 is  IF (A [I] == maxroot) COUT I << << "  " ;
 32      }
 33   }

 

3.[Error] statement has no effect

[ Literal translation should be: an assignment is invalid!

Should be assigned to a global variable, this problem occurs]

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