java用扑克牌计算24点

import java.io.BufferedInputStream;
import java.util.Scanner;
 
public class Main {
 static char[] op= {'#','+','-','*','/',};
 static float cal(float x,float y,int op)
 {
 switch(op)
 {
 case 1:return x+y;
 case 2:return x-y;
 case 3:return x*y;
 case 4:return x/y;
 }
 return 0;
 }
 static float cal_model1(float i,float j,float k,float t,int op1,int op2,int op3)
 {
 float r1,r2,r3;
 r1 = cal(i,j, op1);
 r2 = cal(r1,k, op2);
 r3 = cal(r2,t, op3);
 return r3;
 }
 static float cal_model2(float i,float j,float k,float t,int op1,int op2,int op3)
 {
 float r1,r2,r3;
 r1 = cal(j,k, op2);
 r2 = cal(i,r1, op1);
 r3 = cal(r2,t, op3);
 return r3;
 }
 static float cal_model3(float i,float j,float k,float t,int op1,int op2,int op3)
 {
 float r1,r2,r3;
 r1 = cal(k,t, op3);
 r2 = cal(j,r1, op2);
 r3 = cal(i,r2, op1);
 return r3;
 }
 static float cal_model4(float i,float j,float k,float t,int op1,int op2,int op3)
 {
 float r1,r2,r3;
 r1 = cal(j,k, op2);
 r2 = cal(r1,t, op3);
 r3 = cal(i,r2, op1);
 return r3;
 }
 static float cal_model5(float i,float j,float k,float t,int op1,int op2,int op3)
 {
 float r1,r2,r3;
 r1 = cal(i,j, op1);
 r2 = cal(k,t, op3);
 r3 = cal(r1,r2, op2);
 return r3;
 }
 static int get24(int i,int j,int k,int t)
 {
 int op1,op2,op3;
 int flag = 0;
 for(op1=1;op1<=4;op1++)
   for(op2=1;op2<=4;op2++)
    for(op3=1;op3<=4;op3++)
    {
    if(cal_model1(i,j,k,t,op1,op2,op3)==24){
     System.out.printf("((%d%c%d)%c%d)%c%d\n",i,op[op1],j,op[op2],k,op[op3],t);flag = 1;return flag;
    }
    if(cal_model2(i,j,k,t,op1,op2,op3)==24){
     System.out.printf("(%d%c(%d%c%d))%c%d\n",i,op[op1],j,op[op2],k,op[op3],t);flag = 1;return flag;
  }
    if(cal_model3(i,j,k,t,op1,op2,op3)==24){
     System.out.printf("%d%c(%d%c(%d%c%d))\n",i,op[op1],j,op[op2],k,op[op3],t);flag = 1;return flag;
  }
    if(cal_model4(i,j,k,t,op1,op2,op3)==24){
     System.out.printf("%d%c((%d%c%d)%c%d)\n",i,op[op1],j,op[op2],k,op[op3],t);flag = 1;return flag;
  }
    if(cal_model5(i,j,k,t,op1,op2,op3)==24){
     System.out.printf("(%d%c%d)%c(%d%c%d)\n",i,op[op1],j,op[op2],k,op[op3],t);flag = 1;return flag;
  }
    }
 return 0;
  }
 
 public static void main(String[] args) {
 int x,y,m,n;
 int i,j,k,t;
 int[] in = new int[4];
 int flag=0;
 Scanner sc = new Scanner(new BufferedInputStream(System.in));
 for(i=0;i<4;i++)
 in[i] = sc.nextInt();
 ok:for(i=0;i<4;i++){
   for(j=0;j<4;j++){
    if(j==i) continue;
    for(k=0;k<4;k++){
     if(i==k||j==k) continue;
     for(t=0;t<4;t++){
      if(t==i||t==j||t==k) continue;
      x = in[i];
      y = in[j];
      m = in[k];
      n = in[t];
      flag = get24(x,y,m,n);
      if(flag ==1)break ok;
     }
    }
   }
  }
  if(flag == 0)
  System.out.printf("-1\n");
 }
}