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View Compilation Error

0_0_35248439_13199.cpp:16:17: error: 'stdext' is not a namespace-name
 using namespace stdext;
                 ^
0_0_35248439_13199.cpp:16:23: error: expected namespace-name before ';' token
 using namespace stdext;
                       ^
0_0_35248439_13199.cpp:22:1: error: 'hash_map' does not name a type
 hash_map<usint,usint>S;
 ^
0_0_35248439_13199.cpp: In function 'int main()':
0_0_35248439_13199.cpp:170:9: error: 'S' was not declared in this scope
         S.clear();
         ^
0_0_35248439_13199.cpp:181:9: error: 'hash_map' was not declared in this scope
         hash_map<usint,usint>::iterator tt=S.find(now);
         ^
0_0_35248439_13199.cpp:181:9: note: suggested alternative:
In file included from 0_0_35248439_13199.cpp:9:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/backward/hash_map:83:11: note:   '__gnu_cxx::hash_map'
     class hash_map
           ^
0_0_35248439_13199.cpp:12:15: error: expected primary-expression before 'unsigned'
 #define usint unsigned int
               ^
0_0_35248439_13199.cpp:181:18: note: in expansion of macro 'usint'
         hash_map<usint,usint>::iterator tt=S.find(now);
                  ^
0_0_35248439_13199.cpp:182:15: error: 'tt' was not declared in this scope
         while(tt==S.end()) {
               ^
0_0_35248439_13199.cpp:189:12: error: 'tt' was not declared in this scope
         if(tt==S.end()) printf("poor sisyphus\n");
            ^


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