Fix

Author: doctorlai-msrc

parallel-transform/Makefile

@@ -3,6 +3,7 @@ include ../common.mk
 
 # per-example flags
 # CXXFLAGS += -pthread
+LDLIBS += -ltbb
 
 ## get it from the folder name
 TARGET := $(notdir $(CURDIR))
@@ -12,7 +13,7 @@ OBJS   := $(SRCS:.cpp=.o)
 all: $(TARGET)
 
 $(TARGET): $(OBJS)
-	$(CXX) $(CXXFLAGS) -o $@ $^
+	$(CXX) $(CXXFLAGS) -o $@ $^ $(LDFLAGS) $(LDLIBS)
 
 %.o: %.cpp
 	$(CXX) $(CXXFLAGS) -c $< -o $@

sudoku-solver/main.cpp

@@ -235,7 +235,7 @@ main(int argc, char* argv[])
 {
     if (argc < 2 || argc > 3) {
         print_usage(argv[0]);
-        return 1;
+        return 0;
     }
 
     size_t max_solutions = 0; // 0 means unlimited