Compilare: user.c: In function ‘read’: user.c:18:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%u %u %u\n", &M, &N, &K); ^ user.c:22:10: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%u", &m[i][j]); ^ user.c:24:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%u %u %u %u\n", &xs, &ys, &xe, &ye); ^