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g++ optimization flags

-O0			//optimization for compilation time (default)	
-O1 or -O	//optimization for code size and execution time
-O2			//optimization more for code size and execution time
-O3			//optimization even more for code size and execution time
-Os			//optimization for code size	
-Ofast		//O3 with fast none accurate math calculations

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g++ optimization flags

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