package renren;
import java.util.Scanner;
public class Mainthree {
public static void main(String[] args) {
Scanner s =new Scanner(System.in);
int n = s.nextInt();
int[] numer = new int[n];
for (int i = 0; i < n; i++) {
numer[i] = s.nextInt();
}
System.out.println(getTheCount(n,numer));
}
public static int getTheCount(int n,int[] number) {
int rs = 0;
int allcount = 0;
for (int i = 0; i < number.length; i++) {
allcount += number[i];
}
if(allcount % 2 != 0) {
return rs;
} else {
int left = number[0],right = allcount - number[0];
if(left == right) {
rs ++;
}
for (int i = 1; i < number.length -1; i++) {
left += number[i];
right -= number[i];
if(left == right) {
rs ++;
}
}
}
return rs;
}
}第三道，求指导，为什么AC0？
第三题java答案
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
while (in.hasNext()) {
int n=in.nextInt();
int[] num=new int[n];
for(int i=0;i<n;i++)
num[i]=in.nextInt();
if(n<=1){
System.out.println(0);
}else {
int count=0;
int left=0;
int right=0;
for (int i = 0; i < n - 1; i++) {
if(i==0) {
for (int j = 0; j <= i; j++) {
left += num[j];
}
for (int k = i + 1; k < n; k++) {
right += num[k];
}
}else {
left=left+num[i];
right=right-num[i];
}
if(left==right)
count++;
}
System.out.println(count);
}
}
}
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
while (input.hasNext()){
int size= Integer.parseInt(input.nextLine());
String[] data = input.nextLine().split(" ");
int[] preorder = new int[size];
int[] postorder = new int[size];
int pre = 0;
int post = 0;
for(int i = 0;i < size;i++){
pre += Integer.parseInt(data[i]);
post += Integer.parseInt(data[size - 1 - i]);
preorder[i] = pre;
postorder[size - 1 - i] = post;
}
int result = 0;
for(int i = 0;i < size - 1;i ++){
if(preorder[i] == postorder[i+1])result++;
}
System.out.println(result);
}
}
}
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