View Compilation Error

0_0_13927717_22165.cpp: In function 'int main()':
0_0_13927717_22165.cpp:27:61: error: call of overloaded 'stoi(std::basic_string<char>)' is ambiguous
                 nums.push_back(stoi(s.substr(start, k-start)));
                                                             ^
0_0_13927717_22165.cpp:27:61: note: candidates are:
0_0_13927717_22165.cpp:8:5: note: int stoi(const string&)
 int stoi(const string& str) {
     ^
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++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_13927717_22165.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2858:3: note: int std::stoi(const string&, std::size_t*, int)
   stoi(const string& __str, size_t* __idx = 0, int __base = 10)
   ^