diff --git a/5 b/5
new file mode 100644
index 0000000..d2c4785
--- /dev/null
+++ b/5
@@ -0,0 +1,86 @@
+#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;
+}
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