View Compilation Error

0_0_32789005_23651.cpp: In function 'void init(int)':
0_0_32789005_23651.cpp:5:13: error: unable to find numeric literal operator 'operator""d3f3f3f'
 #define INF 3d3f3f3f
             ^
0_0_32789005_23651.cpp:16:25: note: in expansion of macro 'INF'
                 G[i][j]=INF;
                         ^
0_0_32789005_23651.cpp:5:13: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes
 #define INF 3d3f3f3f
             ^
0_0_32789005_23651.cpp:16:25: note: in expansion of macro 'INF'
                 G[i][j]=INF;
                         ^
0_0_32789005_23651.cpp: In function 'int main()':
0_0_32789005_23651.cpp:5:13: error: unable to find numeric literal operator 'operator""d3f3f3f'
 #define INF 3d3f3f3f
             ^
0_0_32789005_23651.cpp:63:33: note: in expansion of macro 'INF'
                     if(G[x][y]==INF){
                                 ^
0_0_32789005_23651.cpp:5:13: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes
 #define INF 3d3f3f3f
             ^
0_0_32789005_23651.cpp:63:33: note: in expansion of macro 'INF'
                     if(G[x][y]==INF){
                                 ^