java--Algorithm Special training (1) brute force and practicality first

The main contents of the first lesson:
Brute force and practicality first   (1) The importance of brute force in competition and enterprise Application   (2) Practical principles in Brute force (   3) Inverse solution   (4) enumeration method

Topic One:

American mathematician Wiener (N.wiener) had a precocious intellect and went to college at the age of 11.
He was invited to lecture at Tsinghua University in China for 1935-1936 years. Once, he attended an important meeting, and the young faces were striking. Then someone asked him about his age, and he replied, "My age Cube is a 4-digit number." My 4-time-old is a 6-digit number. These 10 numbers just happen to contain 10 numbers from 0 to 9, each of which happens 1 times at a time. "Please calculate how young he was at that time."

Problem Solving methods:

1  PackageCom.algorithm.java.blueBirdge;2 3 //import static sun.misc.Version.println;4 5  Public classTESTSUANFA {6      Public Static voidMain (string[] args) {7         //assuming his age is between 1 and 100 years (40)8          for(inti=10;i<100;i++){9             //four-time judgment on the age of the cubic and the ageTen             intA =i*i*i; One             intb=a*i; A             //turn A into a string -             if(A + ""). Length ()!=4)Continue;//If you convert a from a number to a string, the length is not 4, jump out of the loop -             if(b + ""). Length ()!=6)Continue;//If the B is converted from a number to a string, the length is not 6, jumping out of the loop theSYSTEM.OUT.PRINTLN (i + "four times is" +a+ "of the six-time side is" +b); -         } -     } -  +}

Test results:

Results can be seen: 18

Write the program requirements: practical, fast, stable, effective!

java--Algorithm Special training (1) brute force and practicality first