Compilare: main.c: In function 'search': main.c:67:28: warning: result of '2 << 31' requires 34 bits to represent, but 'int' only has 32 bits [-Wshift-overflow=] if (n == NIL) return (2<<31); ^~ main.c: In function 'pass': main.c:92:17: warning: unused variable 'j' [-Wunused-variable] int i, sum, j, k; ^ main.c: In function 'main': main.c:131:25: warning: result of '2 << 31' requires 34 bits to represent, but 'int' only has 32 bits [-Wshift-overflow=] unsigned int a2_31 = (2<<31); ^~ main.c:130:26: warning: unused variable 'flag' [-Wunused-variable] unsigned int aux, aux2, flag; ^~~~ main.c:127:27: warning: unused variable 'treshold' [-Wunused-variable] int N, A, B, C, i, n, treshold; ^~~~~~~~ main.c:127:24: warning: unused variable 'n' [-Wunused-variable] int N, A, B, C, i, n, treshold; ^ main.c:133:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %d %d",&N, &A, &B, &C); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~