讯飞四道编程题个人思路
第一题：
有面值1,5,10,50,100，分别对应变量：a、b、c、d、e
若有k元钱，最少多少张纸币能找零，若不能则输出-1
public class Main {
public static int minMoney(int[] nums,int target){
int[] money = {1,5,10,50,100};
int count = 0;
for (int i=4;i>=0;i--){
int shang = target/money[i];
int cur_temp = Math.min(nums[i],shang);
count += cur_temp;
target -= cur_temp * money[i];
if (target==0){
return count;
}
}
return -1;
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
while (scanner.hasNext()){
String[] s = scanner.nextLine().trim().split(" ");
int[] nums = new int[s.length];
for (int i = 0; i < s.length; i++) {
nums[i] = Integer.parseInt(s[i]);
}
int target = scanner.nextInt();
System.out.println( minMoney(nums,target));
scanner.nextLine();
}
}
} 第二题：快排，自己注意处理一下输出 public class Main {
public static void mySort(int[] nums,int low,int hight){
int i,j,temp,t;
if(low>hight){
return;
}
i=low;
j=hight;
temp = nums[low];
while (i<j){
while (temp<nums[j] && i<j){
j--;
}
while (temp>=nums[i] && i<j){
i++;
}
if (i<j){
t = nums[j];
nums[j] = nums[i];
nums[i] = t;
}
}
nums[low] = nums[i];
nums[i] = temp;
prin(nums);
System.out.println();
mySort(nums,low,j-1);
mySort(nums,j+1,hight);
}
public static void prin(int[] nums){
for (int k = 0; k < nums.length; k++) {
System.out.print(nums[k]);
if (k!=nums.length-1){
System.out.print(" ");
}
}
System.out.println();
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
while (scanner.hasNext()){
int len = scanner.nextInt();
scanner.nextLine();
String[] s = scanner.nextLine().trim().split(" ");
int[] nums = new int[s.length];
for (int i = 0; i < s.length; i++) {
nums[i] = Integer.parseInt(s[i]);
}
mySort(nums,0,len-1);
}
}
} 第三题：判断给定对角坐标，两个矩形是否相交。 public class Main {
/**
* 解法一：逆向思维，找不相交的情况；
*
*/
public static int isRectangleOverlap(int[] nums){
if (nums[2]<nums[4] || nums[0] > nums[6]
|| nums[1]>nums[7] || nums[3]<nums[5]){
return 0;
}
return 1;
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
while (scanner.hasNext()){
String[] s = scanner.nextLine().trim().split(" ");
int[] nums = new int[s.length];
for (int i = 0; i < s.length; i++) {
nums[i] = Integer.parseInt(s[i]);
}
System.out.println(isRectangleOverlap(nums));
}
}
} 最后一题：从字符串中抽出整数，注意处理负号就行了
public class Main {
public static void convertToInt(String s){
StringBuilder res = new StringBuilder();
int subFlag = 0;
for (int i = 0; i < s.length(); i++) {
if (res.length() ==0 && subFlag == 0 && s.charAt(i) == '-'){
subFlag = 1;
res.append(s.charAt(i));
}
if (s.charAt(i)>='0' && s.charAt(i)<='9'){
res.append(s.charAt(i));
}
}
System.out.println(Long.parseLong(res.toString()));
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
while (scanner.hasNext()){
String s = scanner.nextLine();
convertToInt(s);
}
}
} 
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