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View Compilation Error

0_0_34806499_22310\Main.java:1: 错误: 需要class, interface或enum
using namespace std;
^
0_0_34806499_22310\Main.java:2: 错误: 需要class, interface或enum
int arr1[500001];
^
0_0_34806499_22310\Main.java:3: 错误: 需要class, interface或enum
set<int> s;
^
0_0_34806499_22310\Main.java:4: 错误: 需要class, interface或enum
typedef set<int>::iterator IT;
^
0_0_34806499_22310\Main.java:5: 错误: 需要class, interface或enum
int main()
^
0_0_34806499_22310\Main.java:7: 错误: 需要class, interface或enum
 int n;int CNT=0;
       ^
0_0_34806499_22310\Main.java:8: 错误: 需要class, interface或enum
 while(cin>>n)
 ^
0_0_34806499_22310\Main.java:10: 错误: 需要class, interface或enum
  for(int i=0;i!=n;++i)
              ^
0_0_34806499_22310\Main.java:10: 错误: 需要class, interface或enum
  for(int i=0;i!=n;++i)
                   ^
0_0_34806499_22310\Main.java:12: 错误: 需要class, interface或enum
   int a,b;cin>>a>>b;
           ^
0_0_34806499_22310\Main.java:13: 错误: 需要class, interface或enum
   arr1[a]=b;
   ^
0_0_34806499_22310\Main.java:14: 错误: 需要class, interface或enum
  }
  ^
0_0_34806499_22310\Main.java:16: 错误: 需要class, interface或enum
  s.insert(0);s.insert(INT_MAX);
  ^
0_0_34806499_22310\Main.java:16: 错误: 需要class, interface或enum
  s.insert(0);s.insert(INT_MAX);
              ^
0_0_34806499_22310\Main.java:17: 错误: 需要class, interface或enum
  int result=0;
  ^
0_0_34806499_22310\Main.java:18: 错误: 需要class, interface或enum
  for(int i=n;i>=1;--i)
  ^
0_0_34806499_22310\Main.java:18: 错误: 需要class, interface或enum
  for(int i=n;i>=1;--i)
              ^
0_0_34806499_22310\Main.java:18: 错误: 需要class, interface或enum
  for(int i=n;i>=1;--i)
                   ^
0_0_34806499_22310\Main.java:21: 错误: 需要class, interface或enum
    IT it=--s.find(arr1[i]);
    ^
0_0_34806499_22310\Main.java:22: 错误: 需要class, interface或enum
    if(it==s.begin())
    ^
0_0_34806499_22310\Main.java:24: 错误: 需要class, interface或enum
    else
    ^
0_0_34806499_22310\Main.java:27: 错误: 需要class, interface或enum
  }
  ^
0_0_34806499_22310\Main.java:29: 错误: 需要class, interface或enum
  if(result==1)
  ^
0_0_34806499_22310\Main.java:31: 错误: 需要class, interface或enum
  else
  ^
0_0_34806499_22310\Main.java:33: 错误: 需要class, interface或enum
 }
 ^
0_0_34806499_22310\Main.java:35: 错误: 需要class, interface或enum
}
^
26 个错误


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