BaseballGame

			/**
			 * @param {string[]} ops
			 * @return {number}
			 */
			var calPoints = function(ops) {
				var arr = [];
			    for(var i =0 ;i<ops.length ;i++){
			    	if(ops[i] == "D"){
			    		var length = arr.length;
			    		if(length != 0){
			    			var v = arr[length-1]*2;
			    			arr.push(v);
			    		}
			    	}
				    else if(ops[i] == "C"){
				    	arr.pop();
			    	}
			    	else if(ops[i] == "+"){
			    		var length = arr.length;
			    		if(length == 0){
			    			//
			    		}
			    		if(length == 1){
			    			///var v = arr[length-1];
			    			arr.push(a[length-1]);
			    		}else{
			    			//var v = parseInt()
			    			arr.push( parseInt(arr[length-1]) + parseInt(arr[length-2]) );
			    		}
			    	}else{
			    		arr.push(parseInt(ops[i]));
			    	}
			    }
			    var num = arr.reduce(function(x,y){return x+y;});
			    return num;
			};			/**
			 * @param {string[]} ops
			 * @return {