First task is done

2025.03.28/Matvecmul/main.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include "solve.h"
+
+// Прототип вашей функции перемножения
+void multiply_matrix_vector(int n, double** matrix, double* vector, double* result);
+
+int main(int argc, char* argv[]) {
+    int n, i, j;
+    double* matrix;
+    double* vector;
+    double* result;
+    clock_t start, end;
+    double elapsed;
+
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s <n>\n", argv[0]);
+        return 1;
+    }
+
+    n = atoi(argv[1]);
+    if (n <= 0) {
+        fprintf(stderr, "n must be a positive integer\n");
+        return 1;
+    }
+
+    matrix = (double*)malloc(n * n * sizeof(double));
+    vector = (double*)malloc(n * sizeof(double));
+    result = (double*)malloc(n * sizeof(double));
+
+    srand((unsigned int)time(NULL));
+
+    for (i = 0; i < n; ++i) {
+        vector[i] = rand() % 10;
+        for (j = 0; j < n; ++j)
+            matrix[i*n + j] = rand() % 10;
+    }
+
+    start = clock();
+	
+    matvec_mul(n, matrix, vector, result);
+
+    end = clock();
+    elapsed = (double)(end - start) / CLOCKS_PER_SEC;
+
+    printf("Result vector:\n");
+    for (i = 0; i < (n > 5 ? 5 : n); ++i)
+        printf("%.2f ", result[i]);
+    printf("\n");
+
+    printf("Elapsed time: %.6f seconds\n", elapsed);
+
+    free(matrix);
+    free(vector);
+    free(result);
+
+    return 0;
+}