sudoku.cpp: In function 'void EasyMode(int)': sudoku.cpp:213: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x sudoku.cpp:213: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x sudoku.cpp:213: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x sudoku.cpp: In function 'int main()': sudoku.cpp:231: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result sudoku.cpp:232: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result