/in/foo.cc:7:22: error: expected primary-expression before 'int'
 void dfs(string rpic[int a][int b]){
                      ^~~
/in/foo.cc:7:22: error: expected ']' before 'int'
/in/foo.cc:7:22: error: expected ')' before 'int'
/in/foo.cc:7:22: error: expected initializer before 'int'