Compilare: user.c: In function ‘mul_2vec’: user.c:44:13: warning: unused variable ‘p’ [-Wunused-variable] int t = 0, p, k; ^ user.c: In function ‘main’: user.c:92:12: warning: unused variable ‘x’ [-Wunused-variable] long sum, x, nnn, n1, n12; ^ user.c:92:7: warning: unused variable ‘sum’ [-Wunused-variable] long sum, x, nnn, n1, n12; ^ user.c:102:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d", &T); ^ user.c:111:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d", &N); ^