Compilare: main.c: In function 'read': main.c:23:20: warning: format '%d' expects argument of type 'int *', but argument 3 has type 'size_t * {aka long unsigned int *}' [-Wformat=] fscanf(file, "%d", N); ^ main.c: In function 'main': main.c:115:48: warning: unused variable 'dif' [-Wunused-variable] int *circle, start, length, sum, N_circle, dif;; ^~~ main.c:115:38: warning: unused variable 'N_circle' [-Wunused-variable] int *circle, start, length, sum, N_circle, dif;; ^~~~~~~~ main.c:115:33: warning: unused variable 'sum' [-Wunused-variable] int *circle, start, length, sum, N_circle, dif;; ^~~ main.c:115:25: warning: unused variable 'length' [-Wunused-variable] int *circle, start, length, sum, N_circle, dif;; ^~~~~~ main.c:115:18: warning: unused variable 'start' [-Wunused-variable] int *circle, start, length, sum, N_circle, dif;; ^~~~~ main.c:115:10: warning: unused variable 'circle' [-Wunused-variable] int *circle, start, length, sum, N_circle, dif;; ^~~~~~ main.c: In function 'read': main.c:23:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(file, "%d", N); ^~~~~~~~~~~~~~~~~~~~~ main.c:37:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(file, "%d %d", &v[i], &sign); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c: In function 'main': main.c:141:5: warning: attempt to free a non-heap object 'v' [-Wfree-nonheap-object] free(v); ^~~~~~~