Compilare: user.cpp: In function ‘void Solve()’: user.cpp:144:18: warning: unused variable ‘j’ [-Wunused-variable] int x, y, c, i, j; ^ user.cpp: In function ‘int main()’: user.cpp:212:6: warning: unused variable ‘i’ [-Wunused-variable] int i, t; ^ user.cpp:203:50: 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:204:52: 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); ^