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View Compilation Error

0_0_33696563_18085.cpp: In function 'int main()':
0_0_33696563_18085.cpp:20:29: error: invalid conversion from 'int' to 'std::size_t* {aka long long unsigned int*}' [-fpermissive]
     int num = stoi(s, i, len); 
                             ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_33696563_18085.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2858:3: note: initializing argument 2 of 'int std::stoi(const string&, std::size_t*, int)'
   stoi(const string& __str, size_t* __idx = 0, int __base = 10)
   ^


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