From 1b72f7ac0adb1b2ed007ad9cfaf4e7092679e4fa Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Fri, 30 Sep 2022 14:33:51 +0200
Subject: Added routine to try perturbations until a large one is found.

---
 rbmp.cpp | 41 +++++++++++++++++++++++++++++------------
 1 file changed, 29 insertions(+), 12 deletions(-)

diff --git a/rbmp.cpp b/rbmp.cpp
index e677a11..8ddc591 100644
--- a/rbmp.cpp
+++ b/rbmp.cpp
@@ -132,22 +132,41 @@ int main(int argc, char* argv[]) {
     matching[i] = edgeMatched(pm, G.edges[i]);
   }
 
-  unsigned eFlip = r.variate<unsigned, std::uniform_int_distribution>(0, G.edges.size() - 1);
 
-  while (!matching[eFlip]) {
-    eFlip = r.variate<unsigned, std::uniform_int_distribution>(0, G.edges.size() - 1);
-  }
+  while (true) {
+    unsigned eFlip = r.variate<unsigned, std::uniform_int_distribution>(0, G.edges.size() - 1);
 
-  pm.StartUpdate();
-  pm.UpdateCost(eFlip, 1e10);
-  pm.FinishUpdate();
+    while (!matching[eFlip]) {
+      eFlip = r.variate<unsigned, std::uniform_int_distribution>(0, G.edges.size() - 1);
+    }
 
-  pm.Solve();
+    pm.StartUpdate();
+    pm.UpdateCost(eFlip, 1e10);
+    pm.FinishUpdate();
+
+    pm.Solve();
+
+    unsigned m = 0;
+    for (unsigned i = 0; i < G.edges.size(); i++) {
+      if (!matching[i] && edgeMatched(pm, G.edges[i])) {
+        m++;
+      }
+    }
+
+    if (m > 4 * n) {
+      std::cerr << "Size of excitation: " << m << std::endl;
+      break;
+    } else {
+      pm.StartUpdate();
+      pm.UpdateCost(eFlip, -1e10);
+      pm.FinishUpdate();
+
+      pm.Solve();
+    }
+  }
 
-  unsigned m = 0;
   for (unsigned i = 0; i < G.edges.size(); i++) {
     if (!matching[i] && edgeMatched(pm, G.edges[i])) {
-      m++;
       std::cout
         << G.edges[i].halfedges[0].getTail().coordinate[0] << " "
         << G.edges[i].halfedges[0].getTail().coordinate[1] << " "
@@ -156,7 +175,5 @@ int main(int argc, char* argv[]) {
     }
   }
 
-  std::cerr << "Size of excitation: " << m << std::endl;
-
   return 0;
 }
-- 
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