Fourth, fifth and sixth tasks are done

2025.03.21/04Ex/solve.c

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+#include "solve.h"
+#include <math.h>
+
+#define eps 1e-17
+
+int t4_solve(double *a, int m, int n)
+{
+	int min_i = 0, min_j = 0;
+	double minimum = -1;
+
+	for (int i = 0; i < m; i++)
+	{
+		double sum = 0;
+		for (int j = 0; j < n; j++)
+			sum += fabs(a[i*n + j]);
+
+		if ((minimum - sum) > eps || i == 0) { minimum = sum; min_i = i; }
+	}
+
+	for (int j = 0; j < n; j++)
+	{
+		double sum = 0;
+		for (int i = 0; i < m; i++)
+			sum += fabs(a[i*n + j]);
+
+		if ((minimum - sum) > eps || j == 0) { minimum = sum; min_j = j; }
+	}
+
+	for (int l = min_j+1, del_j = 1; l < min_i*n; l++)
+	{
+		if (l == ((n * del_j) + min_j))
+			del_j++;
+		else 
+			a[l - del_j] = a[l];
+	}
+
+	for (int l = (min_i+1)*n, del_j = min_i; l < m*n; l++)
+	{
+		if (l == ((n * (del_j + 1)) + min_j))
+			del_j++;
+		else 
+			a[l - del_j - n] = a[l];
+	}
+
+	return min_i * n + min_j;
+}