fix a little

solver_soft/Makefile

@@ -2,7 +2,7 @@ TARGET = sim
 OBJS = $(CPPS:.cpp=.o)
 CPPS = $(wildcard *.cpp)
 CXX = g++
-CXXFLAGS = -O3
+CXXFLAGS = -std=c++11 -O3
 
 all: $(TARGET)
 

solver_soft/tools.hpp

@@ -13,4 +13,4 @@ void usage();
 void output_to_file(char *f_name, short int line_num, short int blocks, short int wi, short int hi, short int board[], pair<short int,short int> block_place[]);
 void show_result(short int line_num, short int blocks, short int wi, short int hi, short int board[], pair<short int,short int> block_place[]);
 
-#endif /* __TOOLS_HPP__ */
+#endif /* __TOOLS_HPP__ */
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