add CP_ALGO_CHECKPOINT check, fix alignas on bump_alloc.hpp

Author: adamant-pwn

cp-algo/util/bump_alloc.hpp

@@ -2,7 +2,7 @@
 #define CP_ALGO_UTIL_BUMP_ALLOC_HPP
 #include <cstddef>
 namespace cp_algo {
-    char buf[450 << 20] alignas(32);
+    alignas(32) char buf[450 << 20];
     size_t buf_ind = sizeof buf;
     template<class T> struct bump_alloc {
         typedef T value_type;

cp-algo/util/checkpoint.hpp

@@ -10,7 +10,9 @@ namespace cp_algo {
         double delta = now - last;
         last = now;
         if(msg.size()) {
+#ifdef CP_ALGO_CHECKPOINT
             std::cerr << msg << ": " << delta * 1000 << " ms\n";
+#endif
         }
     }
 }