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View Compilation Error

0_0_30061013_4871.cpp:2:17: error: 'st' is not a namespace-name
 using namespace st;
                 ^
0_0_30061013_4871.cpp:2:19: error: expected namespace-name before ';' token
 using namespace st;
                   ^
0_0_30061013_4871.cpp:6:2: error: 'frinde' does not name a type
  frinde bool operator<(node n1,node n2){
  ^
0_0_30061013_4871.cpp: In function 'int main()':
0_0_30061013_4871.cpp:18:8: error: 'cin' was not declared in this scope
  while(cin>>n){
        ^
0_0_30061013_4871.cpp:18:8: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:74:0,
                 from 0_0_30061013_4871.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
0_0_30061013_4871.cpp:19:3: error: 'priority_queue' was not declared in this scope
   priority_queue<node>a;
   ^
0_0_30061013_4871.cpp:19:3: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/queue:64:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:85,
                 from 0_0_30061013_4871.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_queue.h:370:11: note:   'std::priority_queue'
     class priority_queue
           ^
0_0_30061013_4871.cpp:19:22: error: expected primary-expression before '>' token
   priority_queue<node>a;
                      ^
0_0_30061013_4871.cpp:19:23: error: 'a' was not declared in this scope
   priority_queue<node>a;
                       ^
0_0_30061013_4871.cpp:20:22: error: expected primary-expression before '>' token
   priority_queue<node>b;
                      ^
0_0_30061013_4871.cpp:20:23: error: 'b' was not declared in this scope
   priority_queue<node>b;
                       ^
0_0_30061013_4871.cpp:21:22: error: expected primary-expression before '>' token
   priority_queue<node>c;
                      ^
0_0_30061013_4871.cpp:21:23: error: 'c' was not declared in this scope
   priority_queue<node>c;
                       ^
0_0_30061013_4871.cpp:27:15: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
    if(str[0]=="I"){
               ^
0_0_30061013_4871.cpp:82:1: error: expected '}' at end of input
 }
 ^


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