Compilare: In file included from /usr/include/c++/4.8/cassert:43:0, from user.cpp:6: user.cpp: In function ‘int main()’: user.cpp:116:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(vals[i].ans.size() == vals[i].x); ^ user.cpp:79:50: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".in").c_str(), "r", stdin); ^ user.cpp:80:52: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".out").c_str(), "w", stdout); ^