Compilare: user.c: In function ‘setThreeSums’: user.c:29:15: warning: unused variable ‘t’ [-Wunused-variable] three_sum t; ^ user.c: In function ‘readHeader’: user.c:16:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &(h.n), &(h.s)); ^ user.c: In function ‘readNumbers’: user.c:23:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d ", &v[i]); ^ user.c: In function ‘printResult’: user.c:90:1: warning: control reaches end of non-void function [-Wreturn-type] } ^