科大讯飞 8.29 AK
第一题
import java.util.Scanner;
public class Keda1 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
String line = input.nextLine();
String[] nums = line.split(",");
int n = Integer.valueOf(nums[0]);
int m = Integer.valueOf(nums[1]);
int[][] pan = new int[n][m];
for (int i = 0; i < n; i++) {
String[] stmp = input.nextLine().split(" ");
for (int j = 0; j < m; j++) {
pan[i][j] = Integer.valueOf(stmp[j]);
}
}
int[][] ans = pan;
for (int i = 1; i < m; i++) {
ans[0][i] = ans[0][i] + ans[0][i - 1];
}
for (int i = 1; i < n; i++) {
ans[i][0] = ans[i][0] + ans[i - 1][0];
}
for (int i = 1; i < n; i++) {
for (int j = 1; j < m; j++) {
ans[i][j] = Math.max(ans[i - 1][j], ans[i][j - 1]) + ans[i][j];
}
}
System.out.println(ans[n - 1][m - 1]);
}
}
第二题
import java.util.Scanner;
public class Keda2 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int n = input.nextInt();
int[] nums = new int[n];
String s = input.next();
String[] strings = s.split(",");
for (int i = 0; i < n; i++) {
nums[i] = Integer.valueOf(strings[i]);
}
sort(nums, n);
StringBuilder ans = new StringBuilder();
for (int i = 0; i < n; i++) {
if (i == n - 1) {
ans.append(nums[i] + "");
} else {
ans.append(nums[i] + ",");
}
}
System.out.println(ans.toString());
}
private static void sort(int[] nums, int n) {
for (int i = 0; i < n; i++) {
int minNum = nums[i];
int index = i;
for (int j = i + 1; j < n; j++) {
if (nums[j] < minNum) {
index = j;
minNum = nums[j];
}
}
if (index != i) {
int tmp = nums[i];
nums[i] = nums[index];
nums[index] = tmp;
}
}
}
} 第三题
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class Keda3 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
String line = input.nextLine();
List<Character> res = new ArrayList<Character>();
char[] chars = line.toCharArray();
int n = chars.length;
for (int i = 0; i < n; i++) {
int j = i;
boolean flag = true;
while (j < n && chars[j] == '_') {
j++;
if (i != 0 && flag) {
res.add('_');
flag = false;
}
}
if (j < n && chars[j] != '_') {
res.add(chars[j]);
i = j;
}
}
int size = res.size();
for (int i = size - 1; i >= 0; i--) {
Character character = res.get(i);
if (character != '_') {
break;
} else if (character == '_') {
res.remove(i);
}
}
StringBuilder ans = new StringBuilder();
for (Character re : res) {
ans.append(re);
}
System.out.println(ans.toString());
}
}
第四题
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class Keda4 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
if (isZhiShu(n)) {
System.out.println(n);
}
List<Integer> ans = new ArrayList<Integer>();
zheng(n, ans, 2);
int size = ans.size();
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < size; i++) {
if (i == size - 1) {
stringBuilder.append(ans.get(i));
} else {
stringBuilder.append(ans.get(i) + "*");
}
}
System.out.println(stringBuilder.toString());
}
private static void zheng(int n, List<Integer> ans, int x) {
if (isZhiShu(n)) {
ans.add(n);
return;
}
if (isZhiShu(x)) {
if (n % x == 0) {
ans.add(x);
zheng(n / x, ans, x);
} else {
zheng(n, ans, x + 1);
}
} else {
zheng(n, ans, x + 1);
}
}
private static boolean isZhiShu(int n) {
for (int i = 2; i <= Math.sqrt(n); i++) {
if (n % i == 0) {
return false;
}
}
return true;
}
} 
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