sudoku.cpp: In function 'int main()': sudoku.cpp:71: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x sudoku.cpp:71: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x sudoku.cpp: In function 'bool valid(int, int, int)': sudoku.cpp:22: warning: 'submx' may be used uninitialized in this function sudoku.cpp:22: warning: 'submy' may be used uninitialized in this function