java大数

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import java.util.*;  import java.math.BigInteger;;    public class Main      {          public static void main(String [] args)          {              Scanner cin = new Scanner(System.in);//对于Scanner 类声明对象cin用来扫描控制台输入         int T;        while(cin.hasNext())        {        T = cin.nextInt();        for(int cas = 1; cas <= T; cas++)        {        BigInteger m = cin.nextBigInteger();        BigInteger n = cin.nextBigInteger();        BigInteger k = cin.nextBigInteger();        BigInteger c = new BigInteger("1");//将大数型变量c赋值为1；        BigInteger c2 = new BigInteger("2");//将大数型变量c2赋值为2；        //System.out.println(n.divide(c2));        BigInteger t1 = (m.subtract(c)).divide(c2);        BigInteger t2 = (n.subtract(c)).divide(c2);        System.out.print("Case #");        System.out.print(cas);        System.out.print(": ");        if(((n.multiply(m)).subtract(t1.multiply(t2))).compareTo(k) <= 0 && k.compareTo(n.multiply(m)) <= 0)        {        System.out.println("yes");        }        else        {        System.out.println("no");        }        /*用java写代码的时候一定要一行写完之后在根据Eclipse系统自动判断语法来审查代码的正误 。         * 刚开始就是因为一句还没写完报错结果误以为java用不了&&而导致写成了这样，逻辑不对而wa         * 所以说java的一条语句一定要写完再回头看是否写错了        if(((n.multiply(m)).subtract(t1.multiply(t2))).compareTo(k) <= 0)        {        if(k.compareTo(n.multiply(m)) <= 0)        {        System.out.println("yes");        }        }        else        {        System.out.println("no");        }         *          * */        }        }            cin.close();        }      }

10.7集训第2题，

题目链接：点击打开链接

#include <iostream>#include <cstdio>#include <cmath>using namespace std;int n;int solve(int n){    return n == 1 ? 1 : solve(n/2)+1;}int main(){    int T;    while(~scanf("%d", &T))    {        for(int cas= 1; cas <= T; cas++)        {            scanf("%d", &n);            printf("Case #%d: %d\n", cas, solve(n));        }    }    return 0;}/*主要是找到递推的规律*/

java大数练手

hdu 1002 大数题目链接点击打开链接

import java.util.*;import java.math.*;public class Main {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubScanner cin = new Scanner(System.in);int T;while(cin.hasNext()){T = cin.nextInt();for(int cas= 1; cas <= T; cas++){BigInteger a = cin.nextBigInteger();BigInteger b = cin.nextBigInteger();System.out.print("Case ");System.out.print(cas);System.out.println(":");System.out.print(a);System.out.print(" + ");System.out.print(b);System.out.print(" = ");System.out.println(a.add(b));if(cas < T) System.out.println();}}}}

import java.util.*;import java.math.*;public class Main {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubScanner cin = new Scanner(System.in);int T;while(cin.hasNext()){T = cin.nextInt();for(int cas= 1; cas <= T; cas++){BigInteger a = cin.nextBigInteger();BigInteger b = cin.nextBigInteger();//原来用+号连接就好，不用一行一行的输出System.out.println("Case "+cas+":");System.out.println(a+" + "+b+" = "+a.add(b));//System.out.print("Case ");//System.out.print(cas);//System.out.println(":");//System.out.print(a);//System.out.print(" + ");//System.out.print(b);//System.out.print(" = ");//System.out.println(a.add(b));if(cas < T) System.out.println();}}}}

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