最近在朋友圈有朋友問我，這樣一道題，具體如圖所示：
我的算法：
static void Main(string[] args){/** a + b - 9 = 4* + - - * c - d * e =4* / * -* f + g - h=4* || || ||* 4 4 4 * */int flag = 50;for(int a=0;a<14; a++) //a{for (int b = 0; b <14; b++) //b{//a+b-9=4 故 a+b=13if ((a + b) == 13){//9-e-h=4 故 e+h=5, e<6,h<6for (int e = 0; e < 6; e++) //e {for (int h = 0; h < 6; h++) //h{if ((e + h) == 5) {for (int c = 0; c < flag; c++) //c{//b-d*g=4,b[0-13] 故d*g<10,d,g<10for (int d = 0; d < 10; d++) //d d*g<=9{for (int g = 0; g < 10; g++) //g{//考慮到f為被除數，故f>0,考慮整除c%f==0for (int f = 1; f < flag; f++) //f{while ((c % f )== 0&&(c - d * e) == 4 && (f + g - h) == 4 && (a + c / f) == 4 && (b - d * g) == 4) {Console.WriteLine("----------------------------------");Console.Write("a:{0} ", a.ToString());Console.Write("b:{0} ", b.ToString());Console.Write("c:{0} ", c.ToString());Console.Write("d:{0} ", d.ToString());Console.Write("e:{0} ", e.ToString());Console.Write("f:{0} ", f.ToString());Console.Write("g:{0} ", g.ToString());Console.WriteLine("h:{0} ", h.ToString());Console.WriteLine("----------------------------------");Console.ReadLine();} }}}}}}}}}}}
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