View Compilation Error

0_0_22224526_4721.cpp: In function 'int main()':
0_0_22224526_4721.cpp:145:14: error: expected primary-expression before '?' token
     memo[x] >?= node[x].d + memo[y];
              ^
0_0_22224526_4721.cpp:145:15: error: expected primary-expression before '=' token
     memo[x] >?= node[x].d + memo[y];
               ^
0_0_22224526_4721.cpp:145:36: error: expected ':' before ';' token
     memo[x] >?= node[x].d + memo[y];
                                    ^
0_0_22224526_4721.cpp:145:36: error: expected primary-expression before ';' token
0_0_22224526_4721.cpp:163:27: error: expected primary-expression before '?' token
     if (!node[y].s) best >?= memo[y];
                           ^
0_0_22224526_4721.cpp:163:28: error: expected primary-expression before '=' token
     if (!node[y].s) best >?= memo[y];
                            ^
0_0_22224526_4721.cpp:163:37: error: expected ':' before ';' token
     if (!node[y].s) best >?= memo[y];
                                     ^
0_0_22224526_4721.cpp:163:37: error: expected primary-expression before ';' token