用C++写一个稀疏向量相加

可以使用以下代码实现稀疏向量相加：

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

#define MAX_SIZE 100

typedef struct {
int index;
double value;
} Element;

typedef struct {
int size;
Element elements[MAX_SIZE];
} SparseVector;

SparseVector addSparseVectors(SparseVector v1, SparseVector v2) {
SparseVector result;
result.size = ;
int i = , j = ;
while (i < v1.size && j < v2.size) {
if (v1.elements[i].index == v2.elements[j].index) {
double sum = v1.elements[i].value + v2.elements[j].value;
if (sum != ) {
result.elements[result.size].index = v1.elements[i].index;
result.elements[result.size].value = sum;
result.size++;
}
i++;
j++;
} else if (v1.elements[i].index < v2.elements[j].index) {
result.elements[result.size] = v1.elements[i];
result.size++;
i++;
} else {
result.elements[result.size] = v2.elements[j];
result.size++;
j++;
}
}
while (i < v1.size) {
result.elements[result.size] = v1.elements[i];
result.size++;
i++;
}
while (j < v2.size) {
result.elements[result.size] = v2.elements[j];
result.size++;
j++;
}
return result;
}

int main() {
SparseVector v1 = {3, {{1, 2.}, {3, 4.}, {5, 6.}}};
SparseVector v2 = {4, {{1, 1.}, {2, 2.}, {4, 3.}, {6, 4.}}};
SparseVector result = addSparseVectors(v1, v2);
printf("Result:\n");
for (int i = ; i < result.size; i++) {
printf("%d: %f\n", result.elements[i].index, result.elements[i].value);
}
return ;
}