23333/5

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

#define MAX 1000  


void sparse_matmul_coo(float* A_values, int* A_rowIndex, int* A_colIndex, int A_nonZeroCount,
                       float* B_values, int* B_rowIndex, int* B_colIndex, int B_nonZeroCount,
                       float* C_values, int* C_rowIndex, int* C_colIndex, int* C_nonZeroCount) {
    int currentIndex = 0;

    for (int i = 0; i < A_nonZeroCount; i++) {
        int rowA = A_rowIndex[i];
        int colA = A_colIndex[i];
        float valueA = A_values[i];

        for (int j = 0; j < B_nonZeroCount; j++) {
            int rowB = B_rowIndex[j];
            int colB = B_colIndex[j];
            float valueB = B_values[j];

            if (colA == rowB) {
                float product = valueA * valueB;

                int found = 0;
                for (int k = 0; k < currentIndex; k++) {
                    if (C_rowIndex[k] == rowA && C_colIndex[k] == colB) {
                        C_values[k] += product;
                        found = 1;
                        break;
                    }
                }

                if (!found) {
                    C_rowIndex[currentIndex] = rowA;
                    C_values[currentIndex] = product;
                    C_colIndex[currentIndex] = colB;
                    currentIndex++;
                }
            }
        }
    }

    *C_nonZeroCount = currentIndex;
}

int main() {

    float A_values[] = {1, 2, 3, 4, 5};
    int A_rowIndex[] = {0, 0, 1, 2, 2};
    int A_colIndex[] = {0, 2, 1, 0, 2};
    int A_nonZeroCount = 5;


    float B_values[] = {6, 8, 7, 9};
    int B_rowIndex[] = {0, 2, 1, 2};
    int B_colIndex[] = {0, 0, 1, 2};
    int B_nonZeroCount = 4;


    float C_values[MAX];
    int C_rowIndex[MAX];
    int C_colIndex[MAX];
    int C_nonZeroCount = 0;

    clock_t start_time, end_time;

    start_time = clock();


    sparse_matmul_coo(A_values, A_rowIndex, A_colIndex, A_nonZeroCount,
                      B_values, B_rowIndex, B_colIndex, B_nonZeroCount,
                      C_values, C_rowIndex, C_colIndex, &C_nonZeroCount);


    end_time = clock();


    double elapsed_time = ((double)(end_time - start_time)) / CLOCKS_PER_SEC;
    printf("稀疏矩阵乘法的运行时间：%f 秒\n", elapsed_time);

    

    return 0;
}