diff --git a/verify_output.py b/verify_output.py
index 57222ff4c6953bce81c0fed0bcb1467368c781ab..aeaea0a254f6f15fb36921bee51826762cf269aa 100644
--- a/verify_output.py
+++ b/verify_output.py
@@ -2,6 +2,10 @@ import argparse
 import struct
 
 
+OKGREEN = '\033[92m'
+FAIL = '\033[91m'
+
+
 def verify_output(file):
     with open(file, "rb") as fd:
         # First 4 bytes should be the number of nodes.
@@ -17,12 +21,12 @@ def verify_output(file):
             source_idx, destination_idx, _cost, path_len = struct.unpack(">llql", data)
 
             # The node index lies within the limits.
-            assert source_idx >= 0 and source_idx < nb_nodes, f"The source idx does not have the correct format: {source_idx}"
-            assert destination_idx >= 0 and destination_idx < nb_nodes, f"The destination idx does not have the correct format: {destination_idx}"
+            assert source_idx >= 0 and source_idx < nb_nodes, FAIL + f"The source idx does not have the correct format: {source_idx}"
+            assert destination_idx >= 0 and destination_idx < nb_nodes, FAIL + f"The destination idx does not have the correct format: {destination_idx}"
 
             # The path len can be nul if there is no path.
             # The shortest path cannot contain loops.
-            assert path_len >= 1 and path_len <= nb_nodes, f"The path length is too long or nul: {path_len}"
+            assert path_len >= 1 and path_len <= nb_nodes, FAIL + f"The path length is too long or nul: {path_len}"
 
             if path_len > 0:
                 for i in range(path_len):
@@ -30,20 +34,20 @@ def verify_output(file):
                     hop_idx, = struct.unpack(">l", data)
 
                     # Same... the node index lies within the limits.
-                    assert hop_idx >= 0 and hop_idx < nb_nodes, f"A hop of the path does not have the correct format {hop_idx}"
+                    assert hop_idx >= 0 and hop_idx < nb_nodes, FAIL + f"A hop of the path does not have the correct format {hop_idx}"
                     
                     # The first node should be the source.
                     if i == 0:
-                        assert hop_idx == source_idx, f"The first node of the path is not the source: {hop_idx} (and source is {source_idx})"
+                        assert hop_idx == source_idx, FAIL + f"The first node of the path is not the source: {hop_idx} (and source is {source_idx})"
                     
                     # The last node should be the destination.
                     if i == path_len - 1:
-                        assert hop_idx == destination_idx, f"The first node of the path is not the destination: {hop_idx} (and destination is {destination_idx})"
+                        assert hop_idx == destination_idx, FAIL + f"The first node of the path is not the destination: {hop_idx} (and destination is {destination_idx})"
 
         # The file does not contain anymore bytes
-        assert fd.read() == b"", "The file is not empty"
+        assert fd.read() == b"", FAIL + "The file is not empty"
 
-        print("The file has the correct format!\nThis does not mean that it solves the shortest path problem, but at least it contains readable information...")
+        print(OKGREEN + "The file has the correct format!\nThis does not mean that it solves the shortest path problem, but at least it contains readable information...")
 
 
 if __name__ == "__main__":