c++ vetctor 统计每个值出现次数

C语言中，可以使用向量(vector)来统计每个值出现的次数。下面是一个简单实现的示例：

#include <stdio.h>
#include <stdlib.h>

typedef struct {
    int value;
    int count;
} ValueCount;

int main() {
    int num;
    printf("请输入要统计的数字个数：");
    scanf("%d", &num);
    
    int *numbers = (int*)malloc(num * sizeof(int));
    for (int i = 0; i < num; i++) {
        printf("请输入第%d个数字：", i + 1);
        scanf("%d", &numbers[i]);
    }
    
    ValueCount *counts = (ValueCount*)malloc(num * sizeof(ValueCount));
    int countSize = 0;
    
    for (int i = 0; i < num; i++) {
        int value = numbers[i];
        int found = 0;
        
        for (int j = 0; j < countSize; j++) {
            if (counts[j].value == value) {
                counts[j].count++;
                found = 1;
                break;
            }
        }
        
        if (!found) {
            counts[countSize].value = value;
            counts[countSize].count = 1;
            countSize++;
        }
    }
    
    printf("每个值出现的次数如下：\n");
    for (int i = 0; i < countSize; i++) {
        printf("值：%d，出现次数：%d\n", counts[i].value, counts[i].count);
    }
    
    free(numbers);
    free(counts);
    
    return 0;
}

以上代码通过向量`ValueCount`的方式，统计用户输入的数字数组中，每个值出现的次数，并输出结果。程序首先要求用户输入要统计的数字个数，然后逐个输入这些数字，然后遍历数字数组，对每个值进行统计，通过向量`ValueCount`来记录每个值出现的次数。最后打印出每个值和对应的出现次数。