Compilare: user.c: In function ‘solve’: user.c:118:6: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long int’ [-Wformat=] printf("%d\n%d\n", cost, num_nodes-1); ^ user.c:69:10: warning: unused variable ‘k’ [-Wunused-variable] k, min, posMin; ^ user.c: In function ‘read’: user.c:18:13: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(FIN, "r", stdin); ^ user.c:20:11: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &num_nodes, &num_edges); ^ user.c:40:17: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &i, &j, &c); ^ user.c: In function ‘solve’: user.c:116:13: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(FOUT, "w", stdout); ^ user.c:112:78: warning: ‘posMin’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(S[j] && mat[ posMin ][ j ] < mat[ S[j] ][ j ] ) S[j] = posMin; ^