foo.cpp: In function 'void init()':
foo.cpp:28:39: error: 'assert' was not declared in this scope
   assert(1 <= s[i] && s[i] < 100000000);
                                       ^
foo.cpp:34:38: error: 'assert' was not declared in this scope
   assert(1 <= a[i].d && a[i].d < 1000);
                                      ^