foo.cpp: In constructor 'sz::sz()':
foo.cpp:11:35: error: 'memset' was not declared in this scope
    memset(ss, 0, sizeof(int)*10000);
                                   ^
foo.cpp: In function 'int dg(int, sz)':
foo.cpp:29:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^