Minor changes

(p,t)_sparsification/main.cpp

@@ -6,7 +6,7 @@
 #include <string>
 #include "hash.h"
 #include <omp.h>
-
+#include <thread>
 
 #define NUM_TRIALS 10
 
@@ -18,7 +18,7 @@ namespace po = boost::program_options;
 int main(int argc, char *argv[]) {
 
     srand((unsigned)time(NULL));
-
+    unsigned int nproc = std::thread::hardware_concurrency();
     po::options_description desc("Allowed options");
     desc.add_options()
             ("help", "produce help message")
@@ -66,7 +66,7 @@ int main(int argc, char *argv[]) {
 
 
 
-    #pragma omp parallel for  num_threads(NUM_TRIALS)
+    #pragma omp parallel for  num_threads(nproc)
     for (int i = 0; i < NUM_TRIALS; i++) {
 
         auto start = std::chrono::steady_clock::now();