fix checkpoint

Author: adamant-pwn

cp-algo/number_theory/factorize.hpp

@@ -15,7 +15,7 @@ namespace cp_algo::math {
             base x, y;
             base g = 1;
             while(g == 1) {
-                for(int i = 0; i < 64; i++) {
+                for(int i = 1; i <= 64; i++) {
                     x = f(x);
                     y = f(f(y));
                     if(x == y) [[unlikely]] {

cp-algo/util/checkpoint.hpp

@@ -4,16 +4,16 @@
 #include <chrono>
 #include <string>
 namespace cp_algo {
-    void checkpoint(std::string const& msg = "") {
+    void checkpoint([[maybe_unused]] std::string const& msg = "") {
+#ifdef CP_ALGO_CHECKPOINT
         static double last = 0;
         double now = (double)clock() / CLOCKS_PER_SEC;
         double delta = now - last;
         last = now;
         if(msg.size()) {
-#ifdef CP_ALGO_CHECKPOINT
             std::cerr << msg << ": " << delta * 1000 << " ms\n";
-#endif
         }
+#endif
     }
 }
 #endif // CP_ALGO_UTIL_CHECKPOINT_HPP