check number of paths too

src/main.cpp

@@ -411,6 +411,7 @@ int main(int argc, char **argv) {
 
             uint64_t block_count;
 
+            uint64_t number_of_paths_in_the_original_graph;
             {
                 auto graph = std::make_unique<XG>();
 
@@ -441,6 +442,8 @@ int main(int argc, char **argv) {
                     }
                 }
 
+                number_of_paths_in_the_original_graph = graph->get_path_count();
+
                 auto *blockset = new smoothxg::blockset_t();
                 smoothxg::smoothable_blocks(*graph,
                                             *blockset,
@@ -792,6 +795,13 @@ int main(int argc, char **argv) {
                     validate_progress.finish();
                 }
 
+                if (number_of_paths_in_the_original_graph != smoothed->get_path_count()) {
+                    std::cerr << smoothxg_iter << "] error! path count mismatch between input (" 
+                            << number_of_paths_in_the_original_graph << ") and smoothed graph (" 
+                            << smoothed->get_path_count() << ")" << std::endl;
+                    exit(1);
+                }
+
                 if (!consensus_mapping.empty()) {
                     std::cerr << smoothxg_iter << "::smooth_and_lace] sorting consensus" << std::endl;