According to this — it is a C++11 feature http://www.cplusplus.com/reference/string/to_string/
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According to this — it is a C++11 feature http://www.cplusplus.com/reference/string/to_string/
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52015
What?!! CF uses MinGW?
http://codeforces.com/blog/entry/79
Well, that sucks. ty nevertheless for the clarification.