In file included from /in/Compile/check.cpp:7:
/in/sokoban.hpp:331:9: error: variable 'len' is uninitialized when used here [-Werror,-Wuninitialized]
        len++;
        ^~~
/in/sokoban.hpp:325:12: note: initialize the variable 'len' to silence this warning
    int len;
           ^
            = 0
1 error generated.
/in/Compile/Makefile:16: recipe for target 'main' failed
make: *** [main] Error 1