feat: Initial commit

Laboratorio 2/Esercizio 2/main.c

@@ -0,0 +1,89 @@
+// Laboratorio 2 - Esercizio 2
+// Matteo Schiff - s295565
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int ** matrmalloc(int * nc, int * nr) {
+    FILE *fp_read;
+
+    if ((fp_read = fopen("mat.txt", "r")) == NULL)
+    {
+        puts("Impossibile aprire il file");
+        return NULL;
+    }
+
+    fscanf(fp_read, "%u %u\n", nr, nc);
+
+    int ** mat = malloc(*nr * sizeof(int *));
+
+    for (int i = 0; i < *nr; i++) {
+        int * row = malloc(*nc * sizeof(int));
+        for (int j = 0; j < *nc; j++) {
+            fscanf(fp_read, "%d ", &row[j]);
+        }
+        mat[i] = row;
+    }
+
+    fclose(fp_read);
+    return mat;
+}
+
+void matrfree(int **mat, int nr) {
+    for (int i = 0; i < nr; i++) {
+        free(mat[i]);
+    }
+
+    free(mat);
+}
+
+void separa(int **mat, int nr, int nc, int ** bianchi, int ** neri, int * nbianchi, int * nneri) {
+    int a = nc % 2;
+    int x = nc / 2;
+    int b = nr % 2;
+    int y = nr / 2;
+
+    *nneri = (x + a) * y + x * (y + b);
+    *nbianchi = x * y + (x+a) * (y + b);
+
+    *bianchi = malloc(*nbianchi * sizeof(int));
+    *neri = malloc(*nneri * sizeof(int));
+
+    int conta_bianchi = 0, conta_neri = 0;
+
+    for (int i = 0; i < nr; i++) {
+        for (int j = 0; j < nc; j++) {
+            if ((i+j) % 2 == 0) {
+                (*bianchi)[conta_bianchi++] = mat[i][j];
+            } else {
+                (*neri)[conta_neri++] = mat[i][j];
+            }
+        }
+    }
+}
+
+int main(int argc, char ** argv) {
+    int nc, nr;
+    int ** mat = matrmalloc(&nc, &nr);
+
+    if (mat == NULL) {
+        return 1;
+    }
+
+    int *bianchi, *neri, n_bianchi, n_neri;
+    separa(mat, nr, nc, &bianchi, &neri, &n_bianchi, &n_neri);
+
+    puts("Numeri su caselle bianche:");
+    for (int i = 0; i < n_bianchi; i++)
+        printf("%u\n", bianchi[i]);
+
+    puts("Numeri su caselle nere:");
+    for (int i = 0; i < n_neri; i++)
+        printf("%u\n", neri[i]);
+
+    matrfree(mat, nr);
+    free(bianchi);
+    free(neri);
+
+    return 0;
+}