Compilare: main.c: In function 'pass': main.c:9:36: warning: unused variable 'j' [-Wunused-variable] int count[255], index[255], i, j, sum; ^ main.c: In function 'main': main.c:45:32: warning: unused variable 'index' [-Wunused-variable] int count[255] = {0}, sum, index[255]; ^~~~~ main.c:45:27: warning: unused variable 'sum' [-Wunused-variable] int count[255] = {0}, sum, index[255]; ^~~ main.c:45:9: warning: unused variable 'count' [-Wunused-variable] int count[255] = {0}, sum, index[255]; ^~~~~ main.c:44:25: warning: unused variable 'vi' [-Wunused-variable] unsigned long long int vi; ^~ main.c:43:24: warning: unused variable 'j' [-Wunused-variable] int N, A, B, C, i, j; ^ main.c:47:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %d %d",&N, &A, &B, &C); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~